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Document And Entity Information - USD ($) $ in Thousands	12 Months Ended
Document And Entity Information - USD ($) $ in Thousands	Dec. 31, 2015	Mar. 07, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Trading Symbol	PACB
Entity Registrant Name	PACIFIC BIOSCIENCES OF CALIFORNIA, INC.
Entity Central Index Key	0001299130
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 354,484
Entity Common Stock, Shares Outstanding		85,730,997

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 33,629	$ 36,449
Investments	48,641	64,899
Accounts receivable	5,245	3,406
Inventory	10,955	11,335
Prepaid expenses and other current assets	12,071	1,671
Total current assets	110,541	117,760
Property and equipment, net	8,548	6,601
Long-term restricted cash	4,500
Other long-term assets	7,518	29
Total assets	131,107	124,390
Current liabilities
Accounts payable	4,749	5,608
Accrued expenses	15,551	11,441
Deferred service revenue, current	6,815	6,121
Deferred contractual revenue, current	10,822	6,785
Other liabilities, current	241	1,534
Total current liabilities	38,178	31,489
Deferred service revenue, non-current	1,143	1,129
Deferred contractual revenue, non-current	1,312	19,735
Other liabilities, non-current	1,386	2,153
Notes payable	14,948	13,991
Financing derivative	600	944
Total liabilities	57,567	69,441
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred Stock, $0.001 par value: Authorized 50,000 shares; No shares issued or outstanding
Common Stock, $0.001 par value: Authorized 1,000,000 shares; Issued and outstanding 79,983 and 73,927 shares at December 31, 2015 and 2014, respectively	80	74
Additional paid-in-capital	786,636	736,339
Accumulated other comprehensive income (loss)	(7)	9
Accumulated deficit	(713,169)	(681,473)
Total stockholders' equity	73,540	54,949
Total liabilities and stockholders' equity	$ 131,107	$ 124,390

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Consolidated Balance Sheets [Abstract]
Preferred Stock, par value	$ 0.001	$ 0.001
Preferred Stock, shares authorized	50,000,000	50,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common Stock, par value	$ 0.001	$ 0.001
Common Stock, shares authorized	1,000,000,000	1,000,000,000
Common Stock, shares issued	79,983,000	73,927,000
Common Stock, shares outstanding	79,983,000	73,927,000

Consolidated Statements Of Operations And Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue:
Product revenue	$ 37,502	$ 35,299	$ 20,039
Service and other revenue	10,896	8,511	6,446
Contractual revenue	44,384	16,784	1,696
Total revenue	92,782	60,594	28,181
Cost of Revenue:
Cost of product revenue	30,704	29,626	15,706
Cost of service and other revenue	8,628	7,566	6,056
Total cost of revenue	39,332	37,192	21,762
Gross profit	53,450	23,402	6,419
Operating Expense:
Research and development	60,440	48,230	45,217
Sales, general and administrative	45,187	38,026	38,745
Gain on lease amendments	(23,043)
Total operating expense	82,584	86,256	83,962
Operating loss	(29,134)	(62,854)	(77,543)
Interest expense	(2,926)	(2,828)	(2,478)
Other income (expense), net	364	(478)	728
Net loss	(31,696)	(66,160)	(79,293)
Other comprehensive loss:
Unrealized loss on investments	(16)	(5)	(16)
Comprehensive loss	$ (31,712)	$ (66,165)	$ (79,309)
Net loss per share:
Basic and diluted net loss per share	$ (0.42)	$ (0.94)	$ (1.26)
Shares used in computing basic and diluted net loss per share	75,614	70,475	62,784

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2012	$ 56	$ 645,316	$ 30	$ (536,020)	$ 109,382
Balance, shares at Dec. 31, 2012	56,170
Net loss				(79,293)	(79,293)
Other comprehensive loss			(16)		(16)
Issuance of common stock in conjunction with equity plans	$ 2	3,077			3,079
Issuance of common stock in conjunction with equity plans, shares	1,795
Issuance of common stock in conjunction with "at-the-market" offering, net of issuance costs	$ 8	19,919			19,927
Issuance of common stock in conjunction with "at-the-market" offering, net of issuance costs, shares	8,310
Issuance of warrants in conjunction with debt facility, net of issuance costs		6,196			6,196
Vesting of Common Stock options early exercised		9,905			9,905
Stock-based compensation expense		9,905			9,905
Balance at Dec. 31, 2013	$ 66	684,413	14	(615,313)	69,180
Balance, shares at Dec. 31, 2013	66,275
Net loss				(66,160)	(66,160)
Other comprehensive loss			(5)		(5)
Issuance of common stock in conjunction with equity plans	$ 2	3,966			3,968
Issuance of common stock in conjunction with equity plans, shares	1,901
Issuance of common stock in conjunction with "at-the-market" offering, net of issuance costs	$ 6	38,017			38,023
Issuance of common stock in conjunction with "at-the-market" offering, net of issuance costs, shares	5,751
Vesting of Common Stock options early exercised		9,943			9,943
Stock-based compensation expense		9,943			9,943
Balance at Dec. 31, 2014	$ 74	736,339	9	(681,473)	$ 54,949
Balance, shares at Dec. 31, 2014	73,927				73,927
Net loss				(31,696)	$ (31,696)
Other comprehensive loss			(16)		(16)
Issuance of common stock in conjunction with equity plans	$ 2	7,361			7,363
Issuance of common stock in conjunction with equity plans, shares	1,981
Issuance of common stock in conjunction with "at-the-market" offering, net of issuance costs	$ 4	29,096			29,100
Issuance of common stock in conjunction with "at-the-market" offering, net of issuance costs, shares	4,075
Vesting of Common Stock options early exercised		13,840			13,840
Stock-based compensation expense		13,840			13,840
Balance at Dec. 31, 2015	$ 80	$ 786,636	$ (7)	$ (713,169)	$ 73,540
Balance, shares at Dec. 31, 2015	79,983				79,983

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net loss	$ (31,696)	$ (66,160)	$ (79,293)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	3,677	4,221	5,648
Amortization of debt discount and financing costs	957	793	595
Stock-based compensation	13,840	9,943	9,905
Noncash portion of gain on lease amendments	(3,043)
Other items	(230)	507	(352)
Changes in assets and liabilities
Accounts receivable	(1,738)	(660)	76
Inventory	(2,466)	(1,285)	(60)
Prepaid expenses and other assets	(17,889)	(224)	840
Accounts payable	(716)	3,891	(1,271)
Accrued expenses	5,732	3,536	1,327
Deferred service revenue	708	2,686	386
Deferred contractual revenue	(14,386)	(6,784)	33,304
Other liabilities	(639)	(1,932)	(938)
Net cash used in operating activities	(47,889)	(51,468)	(29,833)
Cash flows from investing activities
Purchase of property and equipment	(3,009)	(1,609)	(909)
Proceeds from disposal of property and equipment	36
Long-term restricted cash	(4,500)
Purchase of investments	(84,579)	(126,413)	(201,547)
Sales of investments	8,317		100
Maturities of investments	92,341	147,586	169,239
Net cash provided by (used in) investing activities	8,606	19,564	(33,117)
Cash flows from financing activities
Proceeds from issuance of common stock from equity plans	7,363	3,968	3,079
Proceeds from issuance of common stock from "at-the-market" offering, net of issuance costs	29,100	38,023	19,927
Proceeds from issuance of debt agreement, net of issuance costs			19,766
Net cash provided by financing activities	36,463	41,991	42,772
Net increase (decrease) in cash and cash equivalents	(2,820)	10,087	(20,178)
Cash and cash equivalents at beginning of period	36,449	26,362	46,540
Cash and cash equivalents at end of period	33,629	36,449	26,362
Supplemental disclosure of cash flow information
Interest paid	1,794	$ 1,794	1,165
Supplemental disclosure of non-cash investing and financing activities
Inventory transferred to (from) property and equipment	$ 2,846		$ (558)

Overview	12 Months Ended
Overview	Dec. 31, 2015
Overview [Abstract]
Overview	NOTE 1. OVERVIEW We design, develop and manufacture sequencing systems to help scientists resolve genetically complex problems. Based on our novel Single Molecule, Real-Time (SMRT®) Sequencing technology, our products enable: de novo genome assembly to finish genomes in order to more fully identify, annotate and decipher genomic structures; full-length transcript analysis to improve annotations in reference genomes, characterize alternatively spliced isoforms and find novel genes; targeted sequencing to more comprehensively characterize genetic variations; and DNA base modification identification to help characterize epigenetic regulation and DNA damage. Our technology combines very high consensus accuracy and long read lengths with the ability to detect real-time kinetic information. In September 2015, we announced that we had launched a new nucleic acid sequencing platform, the PacBio Sequel™ System (the “Sequel System”), which will provide higher throughput, more scalability, a reduced footprint and lower sequencing project costs compared to the PacBio® RS II System, while maintaining the existing benefits of our SMRT Technology. The names “Pacific Biosciences,” “PacBio,” “SMRT,” “SMRTbell,” “Sequel” and our logo are our trademarks.

Summary Of Significant Accounting Policies

12 Months Ended

Dec. 31, 2015

Summary Of Significant Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

NOTE 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation and Consolidation

Our consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States, or U.S. GAAP, as set forth in the Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC. The consolidated financial statements include the accounts of Pacific Biosciences and our wholly owned subsidiaries. All intercompany transactions and balances have been eliminated. Translation adjustments resulting from translating foreign subsidiaries’ results of operations and assets and liabilities into U.S. dollars are immaterial for all periods presented.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes to the financial statements. Our estimates include, but are not limited to, the valuation of inventory, revenue valuation, the valuation of a financing derivative and long-term notes, the valuation and recognition of share-based compensation, the delivery period for collaboration agreements, the useful lives assigned to long-lived assets, and the computation provisions for income taxes. Actual results could differ materially from these estimates.

During 2013 we entered into a Development, Commercialization and License Agreement (the “Roche Agreement”) with F. Hoffman-La Roche Ltd (“Roche”) and received a non-refundable up-front payment of $35.0 million. Revenue for the year ended December 31, 2014 included four quarterly periods of amortization of $1.7 million from the non-refundable up-front payment of $35.0 million. During the first quarter of 2015, we revised the estimated period over which the delivery of elements pursuant to the Roche Agreement is expected to occur, due to an increased level of certainty regarding the development period. As a result, we are, on a prospective basis, recognizing the remaining deferred contractual revenue associated with the upfront payment received under the Roche Agreement over the revised estimated remaining development period. For the year ended December 31, 2015, this change in estimate increased contractual revenue by $7.6 million, and decreased our basic and diluted net loss per share by $0.10 per share.

Fair Value of Financial Instruments

The carrying amount of our accounts receivable, prepaid expenses, other current assets, accounts payable, accrued expenses and other liabilities, current, approximate fair value due to their short maturities. The carrying value of our other liabilities, non-current, approximates fair value due to the time to maturity and prevailing market rates.

The fair value hierarchy established under U.S. GAAP requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level input that is significant to the fair value measurement. The three levels of inputs that may be used to measure fair value are as follows:

•

Level 1: quoted prices in active markets for identical assets or liabilities;

•

Level 2: inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and

•

Level 3: unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

We consider an active market as one in which transactions for the asset or liability occurs with sufficient frequency and volume to provide pricing information on an ongoing basis. Conversely, we view an inactive market as one in which there are few transactions for the asset or liability, the prices are not current, or price quotations vary substantially either over time or among market makers. Where appropriate, our non-performance risk, or that of our counterparty, is considered in determining the fair values of liabilities and assets, respectively.

Our cash deposits and money market funds are classified within Level 1 of the fair value hierarchy because they are valued using bank balances or quoted market prices. Our investments are classified as Level 2 instruments based on market pricing and other observable inputs. None of our investments are classified within Level 3 of the fair value hierarchy.

Assets and liabilities measured at fair value are classified in their entirety based on the lowest level input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the entire fair value measurement requires management to make judgments and consider factors specific to the asset or liability.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table sets forth the fair value of our financial assets and liabilities that were measured on a recurring basis as of December 31, 2015 and 2014, respectively (in thousands):



	December 31, 2015								December 31, 2014
(in thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets
Cash and cash equivalents:
Cash and money market funds	$	22,034	$	—	$	—	$	22,034	$	21,952	$	—	$	—	$	21,952
Commercial paper		—		8,595		—		8,595		—		14,497		—		14,497
US government & agency securities		—		3,000		—		3,000		—		—		—		—
Total cash and cash equivalents		22,034		11,595		—		33,629		21,952		14,497		—		36,449
Investments:
Commercial paper		—		15,903		—		15,903		—		43,653		—		43,653
Corporate debt securities		—		1,265		—		1,265		—		8,173		—		8,173
US government & agency securities		—		28,136		—		28,136
Asset backed securities		—		3,337		—		3,337		—		13,073		—		13,073
Total investments		—		48,641		—		48,641		—		64,899		—		64,899
Long-term restricted cash:
Cash		4,500		—		—		4,500		—		—		—		—
Total assets measured at fair value	$	26,534	$	60,236	$	—	$	86,770	$	21,952	$	79,396	$	—	$	101,348

Liabilities
Financing derivative	$	—	$	—	$	600	$	600	$	—	$	—	$	944	$	944
Total liabilities measured at fair value	$	—	$	—	$	600	$	600	$	—	$	—	$	944	$	944

The estimated fair value of the Financing Derivative liability (as defined in Note 6 Notes payable) was determined using Level 3 inputs, or significant unobservable inputs. Changes to the estimated fair value of the Financing Derivative are recorded in “Other income (expense), net” in the consolidated statements of operations and comprehensive loss.

The following table provides the changes in the fair value of the Financial Derivative for the year ended December 31, 2015 and 2014 (in thousands), respectively.



Financing Derivative	Amount
Balance as of December 31, 2013	$	549
Loss on change in fair value of Financing Derivative		395
Balance as of December 31, 2014		944
Gain on change in fair value of Financing Derivative		(344)
Balance as of December 31, 2015	$	600

For the year ended December 31, 2015, there were no transfers between Level 1, Level 2, or Level 3 assets or liabilities reported at fair value on a recurring basis and our valuation techniques did not change compared to the prior year.

Financial Assets and Liabilities Not Measured at Fair Value on a Recurring Basis

The carrying amount of our accounts receivable, prepaid expenses, other current assets, accounts payable, accrued expenses and other current liabilities approximate fair value due to their short maturities. The carrying value of our facility financing obligation approximates fair value due to the time to maturity and prevailing market rates.

We determined the fair value of the Notes (as defined in Note 6 Notes payable) from the debt facility we entered into during the first quarter of 2013 using Level 3 inputs, or significant unobservable inputs. The value of the Notes was determined by comparing the difference between the fair value of the Notes with and without the Financing Derivative by calculating the respective present values from future cash flows using a 13.5% and 19.5% weighted average market yield at December 31, 2015 and December 31, 2014, respectively. Refer to Note 6 Notes payable for additional details regarding the Notes. The estimated fair value and carrying value of the Notes are as follows (in thousands):



	December 31, 2015				December 31, 2014
	Fair Value		Carrying Value		Fair Value		Carrying Value
Long-term notes payable	$	18,037	$	14,948	$	14,817	$	13,991

Cash and Cash Equivalents

We consider all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents.

Investments

We have designated all investments as available-for-sale and therefore, such investments are reported at fair value, with unrealized gains and losses recognized in accumulated other comprehensive income (loss) (“OCI”) in stockholders’ equity. The cost of marketable securities is adjusted for the amortization of premiums and discounts to expected maturity. Premium and discount amortization is included in other income, net. Realized gains and losses, as well as interest income, on available-for-sale securities are also included in other income, net. The cost of securities sold is based on the specific identification method. We include all of our available-for-sale securities in current assets.

All of our investments are subject to a periodic impairment review. We recognize an impairment charge when a decline in the fair value of our investments below the cost basis is judged to be other-than-temporary. Factors considered in determining whether a loss is temporary include the length of time and extent to which the investments fair value has been less than the cost basis, the financial condition and near-term prospects of the investee, extent of the loss related to credit of the issuer, the expected cash flows from the security, our intent to sell the security and whether or not we will be required to sell the security before the recovery of its amortized cost. During the years ended December 31, 2015, 2014 and 2013, we did not recognize any impairment charges on our investments as it is more likely than not that we will recover their amortized cost basis upon sale or maturity.

Concentration of Credit Risk

The counterparties to the agreements relating to our investment securities consist of various major corporations, financial institutions, municipalities and government agencies of high credit standing. Our accounts receivable are derived from net revenue to customers and distributors located in the United States and other countries. We perform credit evaluations of our customers’ financial condition and, generally, require no collateral from our customers. We regularly review our accounts receivable including consideration of factors such as historical experience, credit quality, the age of the accounts receivable balances and current economic conditions that may affect a customer’s ability to pay. We have not experienced any significant credit losses to date.

For the year ended December 31, 2015, 2014 and 2013, excluding contractual revenue, no single end customer accounted for more than 10% of our total revenue, respectively.

As of December 31, 2015 and 2014, 64% and 58%, respectively, of our accounts receivable were from domestic customers. As of December 31, 2015, four customers each represented more than 10% of our net accounts receivable. As of December 31, 2014, three customers each represented more than 10% of our net accounts receivable.

Inventory

Inventory is valued at the lower of standard cost, which approximates actual cost, or market. Cost is determined using the first-in, first-out (“FIFO”) method. Adjustments to reduce the cost of inventory to its net realizable value, if required, are made for estimated excess or obsolete balances.

Property and Equipment, Net

Property and equipment are stated at cost, net of accumulated depreciation and any impairment charges. Depreciation is computed using the straight-line method over the estimated useful life of the asset, generally two to three years for computer equipment, three to five years for software, three to seven years for furniture and fixtures, three years for lab equipment and 30 years for buildings. Leasehold improvements are depreciated over the shorter of the lease term or the estimated useful life of the related asset. Major improvements are capitalized, while maintenance and repairs are expensed as incurred.

In connection with build-to-suit lease arrangements that we account for as if we own the facility, we record the facility at the fair value at the date construction commences, prior to significant renovations, plus the costs of the renovations. We determined the fair value of such facilities prior to renovation based on several factors, including an appraisal conducted by an independent licensed appraiser.

Long-term Restricted Cash

Long-term restricted cash as of December 31, 2015 was comprised of $4.5 million pledged as collateral for an irrevocable letter of credit for our O’Brien Lease entered into in July 2015. The letters of credit currently expire in more than one year. The time deposit securing the letter of credit was classified as Long-term restricted cash in the accompanying consolidated balance sheets as of December 31, 2015.

Impairment of Long-Lived Assets

We periodically review property and equipment for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset is impaired or the estimated useful lives are no longer appropriate. Fair value is estimated based on discounted future cash flows. If indicators of impairment exist and the undiscounted projected cash flows associated with such assets are less than the carrying amount of the asset, an impairment loss is recorded to write the asset down to its estimated fair value. To date, we have not recorded any impairment charges.

Revenue Recognition

Our revenue is generated primarily from the sale of products and services, in addition to revenue from collaboration agreements. Product revenue consists of sales of our instruments and related consumables; Service and other revenue primarily consist of revenue earned from product maintenance agreements, instrument lease agreements and grant revenue. Contractual revenue relates to revenue recognized from the collaboration agreement under which we received an upfront fee and may receive contingent milestone payments. Our deliverables under the arrangement includes licenses to intellectual property rights and research and development services.

We recognize revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price is fixed or determinable, and collectability is reasonably assured. For instances where final acceptance of the product or system is required, revenue is deferred until all acceptance criteria have been met. Revenue for product sales is generally recognized upon customer acceptance. For certain qualified distributors revenue is recognized based upon shipment terms. Revenue for product maintenance agreements is recognized when earned, which is generally ratably over the service period. In order to assess whether the price is fixed or determinable, we evaluate whether refund rights exist. If refund rights exist or payment terms are based on future performance, we defer revenue recognition until the price becomes fixed or determinable. We assess collectability based on a number of factors, including customer creditworthiness. If we determine that collection of amounts due is not reasonably assured, revenue recognition is deferred until receipt of payment.

We regularly enter into arrangements, comprised of one or more contracts, from which revenue is derived from multiple deliverables including a mix of products and or services. Revenue recognition for contracts with multiple deliverables is based on the individual units of accounting determined to exist in the contract. A delivered item is considered a separate unit of accounting when (i) the delivered item has value to the customer on a stand-alone basis; and (ii) if a general right of return exists, the delivery or performance of an undelivered item is considered probable and under our control. Items are considered to have stand-alone value when they are sold separately by any vendor or when the customer could resell the item on a stand-alone basis. Our revenue arrangements generally do not have a general right of return. When a deliverable does not meet the criteria to be considered a separate unit of accounting, we group it with other deliverables that, when combined, meet the criteria, and the appropriate allocation of arrangement consideration and revenue recognition is determined. Consideration is allocated at the inception of the contract to all deliverables based on their relative selling price. In order to determine the relative selling price of a deliverable, we apply, in order, vendor-specific objective evidence (“VSOE”); third-party evidence if VSOE is not available; and lastly our best estimate of selling price for the deliverable if neither VSOE nor third-party evidence is available.

In order to establish VSOE, we must regularly sell the product or service on a standalone basis with a substantial majority of sales priced within a relatively narrow range. If an insufficient number of standalone sales exist and VSOE cannot be determined, we then consider whether third party evidence can be used to establish selling price. Due to the lack of similar products and services sold by other companies within our industry, we have not established selling price using third-party evidence. If neither VSOE nor third party evidence of selling price exists, we determine our best estimate of selling price using a combination of prices set by our pricing committee adjusted for applicable discounts and customer orders received to date.

For our collaboration agreement, the process for determining estimates of selling prices of the identifiable deliverables involves significant judgments and estimates to be made by management. Our process considers multiple factors such as estimated headcount, annual research and development budget, estimated length of the research and development period and estimated transfer price on cost, which may vary over time, depending upon the circumstances, and are specific to each deliverable. If the estimated obligation period of one or more deliverables should change, the future amortization of the revenue would also change.

Deferred service revenue primarily represents product maintenance agreement revenue that is expected to be recognized over the related service period, generally one to three years.

For instrument lease agreements we entered into with our customers so far, they are classified as operating-type leases and revenue from these leases is recognized on a straight-line basis over the respective lease term, once the lessee takes (or has the right to take) control/possession of the property under the lease. Effectively, this occurs once installation is complete and acceptance has been obtained.

We recognize milestone revenues as they become earned. Based on Accounting Standards Codification, or ASC, Topic 605-28, Revenue Recognition — Milestone Method, we evaluate contingent milestones at inception of the agreement, and recognize consideration that is contingent upon the achievement of a milestone in its entirety as revenue in the period in which the milestone is achieved only if the milestone is considered substantive in its entirety. Milestones are considered substantive if the consideration earned from the achievement of the milestone (i) is consistent with performance required to achieve the milestone or the increase in value to the delivered item, (ii) relates solely to past performance and (iii) is reasonable relative to all of the other deliverables and payments within the arrangement.

Cost of Revenue

Cost of revenue reflects the direct cost of product components, third-party manufacturing services and our internal manufacturing overhead and customer service infrastructure costs incurred to produce, deliver, maintain and support our instruments, consumables, and services. There are no incremental costs associated with our contractual revenue; all product development costs are reflected in research and development expense.

Manufacturing overhead is predominantly comprised of labor costs. We determine and capitalize manufacturing overhead into inventory based on a standard cost model that approximates actual costs. Prior to achieving manufacturing volumes that correlated with our estimated normal capacity (the production levels expected to be achieved over a number of periods under normal circumstances with available resources), we based our capitalized overhead relative to our normal capacity. Prior to achieving normal capacity, excess manufacturing resources were engaged in research and development activities, including; next generation products, internal use research products, and general support activities. As such, manufacturing costs in excess of amounts reflected in inventory were expensed as a component of research and development expense.

Service costs include the direct costs of components used in support, repair and maintenance of customer instruments as well as the cost of personnel, materials, shipping and support infrastructure necessary to support the installed customer base. Prior to the fourth quarter of 2013, the capacity of our existing service infrastructure exceeded the number of installed customer instruments. Therefore, management estimated the capacity of the existing service infrastructure and recognized the service-related cost of revenue based on the installed base. As a result, prior to the fourth quarter of 2013, total service infrastructure costs exceeded the costs associated with the support of customer instruments and such excess costs were included as a component of sales, general and administrative expense.

Research and Development

Research and development expense consists primarily of expenses for personnel engaged in the development of our SMRT technology, the design and development of our future products and current product enhancements. These expenses also include prototype-related expenditures, development equipment and supplies, facilities costs and other related overhead. We expense research and development costs during the period in which the costs are incurred. However, we defer and capitalize non-refundable advance payments made for research and development activities until the related goods are received or the related services are rendered.

Leases

We categorize leases at their inception as either operating or capital leases. On certain of our lease agreements, we may receive tenant improvement allowances, rent holidays and other incentives. Rent expense is recorded on a straight-line basis over the term of the lease. The difference between rent expense recognized and amounts paid under the lease agreement is recorded as deferred rent in the balance sheets. Leasehold improvements are capitalized at cost and depreciated over the shorter of their expected useful life or the life of the lease. Tenant improvements afforded to us by landlord incentives are recorded as leasehold improvement assets with corresponding deferred rent liabilities.

For build-to-suit lease arrangements, we evaluate the extent of our financial and operational involvement in the tenant improvements to determine whether we are considered the owner of the construction project under U.S. GAAP. When we are considered the owner of a project, we record the shell of the facility at its fair value at the date construction commences with a corresponding facility financing obligation. Improvements to the facility during the construction project are capitalized and, to the extent funded by lessor afforded incentives, with corresponding increases to the facility financing obligation. Payments we make under leases in which we are considered the owner of the facility are allocated to land rental expense, based on the relative values of the land and building at the commencement of construction, reductions of the facility financing obligation and interest expense recognized on the outstanding obligation. To the extent gross future payments do not equal the recorded liability, the liability is settled upon return of the facility to the lessor. Any difference between the book value of the assets and remaining facility obligation are recorded in other expense, net. For existing arrangements, the differences are expected to be immaterial.

Income Taxes

We account for income taxes under the asset and liability method, which requires, among other things, that deferred income taxes be provided for temporary differences between the tax basis of our assets and liabilities and the amounts reported in the financial statements. In addition, deferred tax assets are recorded for the future benefit of utilizing net operating losses and research and development credit carryforwards. A full valuation allowance is provided against our net deferred tax assets as it is more likely than not that the deferred tax assets will not be fully realized.

We review our positions taken relative to income taxes. To the extent our tax positions are more likely than not to result in the payout of additional taxes, we accrue the estimated amount of tax for such uncertain positions.

Stock-based Compensation

Stock-based compensation expense for all stock-based compensation awards is based on the grant date fair value estimated using the Black-Scholes option pricing model. We have limited historical information available to support the underlying estimates of certain assumptions required to value stock options. The expected term of options is estimated based on the simplified method. We do not have sufficient trading history to solely rely on the volatility of our own common stock for establishing expected volatility. Therefore, we based our expected volatility on the historical stock volatilities of our common stock as well as several comparable publicly listed companies over a period equal to the expected term of the options. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant for the expected term of the stock option. We estimate our forfeiture rate based on an analysis of our actual forfeitures and will continue to evaluate the adequacy of the forfeiture rate based on actual forfeiture experience, analysis of employee turnover behavior and other factors. The impact from a forfeiture rate adjustment will be recognized in full in the period of adjustment, and if the actual number of future forfeitures differs from that which was estimated, we may be required to record adjustments to stock-based compensation expense in future periods. We recognize compensation expense on a straight-line basis over the requisite service period. We elected to use the simplified method to calculate the beginning pool of excess tax benefits.

Other Comprehensive Income (loss)

Other comprehensive income (loss) is comprised of unrealized gains (losses) on our investment securities.

Recent Accounting Pronouncements

Recently Adopted Accounting Standards

In November 2015, the FASB issued ASU 2015-17, Income Taxes: Balance Sheet Classification of Deferred Taxes, which requires that deferred tax assets and liabilities be classified as noncurrent on the consolidated balance sheet. ASU 2015-17 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. Early adoption is permitted, and the standard may be applied either retrospectively or on a prospective basis to all deferred tax assets and liabilities, and we have elected to early adopt ASU 2015-17 prospectively, effective for the year ended December 31, 2015, as permitted by the standard. The early adoption of this update did not have a material impact on our consolidated financial statements.

In April 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-03, Simplifying the Presentation of Debt Issuance Costs, which changes the presentation of debt issuance costs in financial statements. ASU 2015-03 requires an entity to present such costs in the consolidated balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the costs will continue to be reported as interest expense. ASU 2015-03 is effective for annual reporting periods beginning after December 15, 2015 and is effective for us in the first quarter of fiscal 2016. Early adoption is permitted, and we elected to apply the new guidance retrospectively to each prior period presented, as permitted by the standard. Early adoption is also permitted for financial statements that have not been previously issued, and we elected to early adopt the accounting standard for the year ended December 31, 2015, as permitted by the standard. The early adoption of ASU 2015-03 did not have a material impact on the consolidated statements of operations and comprehensive loss. The impact of early adoption on the consolidated balance sheets for the periods presented is noted in the table below (in thousands):


	December 31, 2015						December 31, 2014
(in thousands)	Prior to Adoption of ASU 2015-03		ASU 2015-03 Adjustment		As adopted		Prior to Adoption of ASU 2015-03		ASU 2015-03 Adjustment		As adopted

Other long-term assets	$	7,631	$	(113)	$	7,518	$	162	$	(133)	$	29
Total assets		7,631		(113)		7,518		162		(133)		29

Notes payable		15,061		(113)		14,948		14,124		(133)		13,991
Total liabilities	$	15,061	$	(113)	$	14,948	$	14,124	$	(133)	$	13,991

Recently Issued Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases. The guidance in ASU 2016-02 supersedes the lease recognition requirements in ASC Topic 840, Leases. ASU 2016-02 requires an entity to recognize assets and liabilities arising from a lease for both financing and operating leases, along with additional qualitative and quantitative disclosures. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. We are currently evaluating the new guidance to determine the impact it may have to our consolidated financial statements.

In July 2015, the FASB issued ASU 2015-11, Simplifying the Measurement of Inventory, which simplifies the subsequent measurement of inventory by replacing today’s lower of cost or market test with a lower of cost and net realizable value test. The guidance applies only to inventories for which cost is determined by methods other than last-in first-out (“LIFO”) and the retail inventory method (“RIM”). Entities that use LIFO or RIM will continue to use existing impairment models (e.g., entities using LIFO would apply the lower of cost or market test). ASU 2015-11 is effective for annual report periods beginning after December 15, 2016 and is effective for us in the first quarter of 2017. Early adoption is permitted as of the beginning of an interim or annual reporting period. The new guidance must be applied prospectively after the date of adoption. The adoption of ASU 2015-11 is not expected to have a material impact on our consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, requiring an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The updated standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective and permits the use of either the retrospective or cumulative effect transition method. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers: Deferral of the Effective Date, which deferred the effective date of the new revenue standard for periods beginning after December 15, 2016 to December 15, 2017, with early adoption permitted but not earlier than the original effective date. Accordingly, the updated standard is effective for us in the first quarter of 2018. We are currently evaluating the new guidance to determine the impact it may have to our consolidated financial statements.

Contractual Revenue	12 Months Ended
Contractual Revenue	Dec. 31, 2015
Contractual Revenue [Abstract]
Contractual Revenue	NOTE 3. CONTRACTUAL REVENUE During September 2013, we entered into the Roche Agreement with Roche, pursuant to which we account for, and recognize as revenue, the up-front payment received thereunder using the proportional performance method over the periods in which the delivery of elements pursuant to the agreement occurs. We recognize revenue using a straight-line convention over the estimated service periods of the deliverables as this method approximates our performance of services pursuant to the agreement. Out of the $35.0 million upfront cash payment received, quarterly amortization of $1.7 million has been recognized as contractual revenue from the fourth quarter of 2013 to the fourth quarter of 2014. Beginning in January 1, 2015, we revised the estimated development period related to our contractual revenue amortization based on increased certainty of the development time period on a prospective approach. Quarterly amortization of $3.6 million has been recognized as contractual revenue for each of the four quarters of 2015. The additional contractual revenue of $1.9 million per quarter, $7.6 million in total for the year ended December 31, 2015, had a 100% margin and thus decreased our net loss for the year ended December 31, 2015 by $7.6 million and decreased our basic and diluted net loss per share for the year ended December 31, 2015 by $0.10 per share. At December 31, 2015, going forward, on a prospective basis, we will recognize the remaining deferred contractual revenue of $12.1 million associated with upfront payment received under the Roche Agreement over the revised estimated remaining delivery period. In addition to the deliverables above, the Roche Agreement provides for additional payments totaling up to $40.0 million upon the achievement of certain development milestones. Consideration from development milestones is recognized in the period in which a milestone is achieved only if the milestone is considered substantive in its entirety. We achieved the first development milestone under the Roche Agreement and recorded the related $10.0 million as contractual revenue during the year ended December 31, 2014. We achieved the second and third (final) development milestones under the Roche Agreement and recognized the related $10.0 million and $20.0 million, respectively, as contractual revenue during the year ended December 31, 2015.

Cash And Cash Equivalents And Investments

12 Months Ended

Dec. 31, 2015

Cash And Cash Equivalents And Investments [Abstract]

Cash And Cash Equivalents And Investments

NOTE 4. CASH AND CASH EQUIVALENTS AND INVESTMENTS

The following table summarizes our cash, cash equivalents and investments as of December 31, 2015 and December 31, 2014 (in thousands):



	As of December 31, 2015
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	Cost		gains		losses		Value
Cash and cash equivalents:
Cash and money market funds	$	22,034	$	—	$	—	$	22,034
Commercial paper		8,595		—		—		8,595
US government & agency securities		3,000		—		—		3,000
Total cash and cash equivalents		33,629		—		—		33,629
Investments:
Commercial paper		15,903		2		(2)		15,903
Corporate debt securities		1,266		—		(1)		1,265
Asset backed securities		3,337		—		—		3,337
US government & agency securities		28,142		4		(10)		28,136
Total investments		48,648		6		(13)		48,641
Long-term restricted cash:
Cash		4,500		—		—		4,500
Total cash, cash equivalents and investments	$	82,277	$	6	$	(13)	$	82,270
Total Long-term restricted cash	$	4,500	$	—	$	—	$	4,500

	As of December 31, 2014
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	Cost		gains		losses		Value
Cash and cash equivalents:
Cash and money market funds	$	21,952	$	—	$	—	$	21,952
Commercial paper		14,496		1		—		14,497
Total cash and cash equivalents		36,448		1		—		36,449
Investments:
Commercial paper		43,648		5		—		43,653
Corporate debt securities		8,170		7		(4)		8,173
Asset backed securities		13,073		4		(4)		13,073
Total investments		64,891		16		(8)		64,899
Total cash, cash equivalents and investments	$	101,339	$	17	$	(8)	$	101,348

The following table summarizes the contractual maturities of our cash equivalents and available-for-sale investments, excluding money market funds, as of December 31, 2015:



(in thousands)	Fair Value
Due in one year or less	$	60,236

Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.

Balance Sheet Components

12 Months Ended

Dec. 31, 2015

Balance Sheet Components [Abstract]

Balance Sheet Components

NOTE 5. BALANCE SHEET COMPONENTS

Inventory:

As of December 31, 2015 and 2014, our inventory consisted of the following components:



	December 31,
(in thousands)	2015		2014
Purchased materials	$	4,041	$	3,150
Work in process		3,576		6,115
Finished goods		3,338		2,070
Inventory	$	10,955	$	11,335

Prepaid Expenses and Other Current Assets:

As of December 31, 2015 and 2014, our prepaid expenses and other current assets consisted of the following components:


	December 31,
(in thousands)	2015		2014
Receivable from existing landlord	$	10,000	$	—
Prepaid expenses		1,330		1,564
Other current assets		741		107
Prepaid expenses and other current assets	$	12,071	$	1,671

Receivable from existing landlord of $10.0 million as of December 31, 2015 is part of the $15.0 million of future payments receivable from our existing landlord for our Menlo Park facility real property leases, as described in further details in Note 7 “Commitments and contingencies”. Of the amount receivable, $10.0 million was recorded as a short term receivable in “Prepaid and Other Current Assets” and the final $5.0 million was recorded in “Other Long-term Assets” as of December 31, 2015, based on the expected timing of receipt of the payment.

Property and Equipment, Net:

As of December 31, 2015 and 2014, our property and equipment, net, consisted of the following components:



	December 31,
(in thousands)	2015		2014
Building	$	1,160	$	1,160
Laboratory equipment and machinery		20,358		17,169
Leasehold improvements		8,348		8,348
Computer equipment		6,781		4,885
Software		4,798		4,485
Furniture and fixtures		968		958
Construction in progress		—		53
		42,413		37,058
Less: Accumulated depreciation		(33,865)		(30,457)
Property and equipment, net	$	8,548	$	6,601

Depreciation expense during the years ended December 31, 2015, 2014 and 2013 was $3.7 million, $4.2 million and $5.6 million, respectively.

Accrued Expenses:

As of December 31, 2015 and 2014, our accrued expenses consisted of the following components:



	December 31,
(in thousands)	2015		2014
Salaries and benefits	$	8,129	$	6,325
Accrued license and development services		5,459		3,741
Inventory accrual, professional services, accrued interest and other		1,963		1,375
Accrued expenses	$	15,551	$	11,441

Notes Payable

12 Months Ended

Dec. 31, 2015

Notes Payable [Abstract]

Notes Payable

NOTE 6. NOTES PAYABLE

Pursuant to a Facility Agreement (the “Facility Agreement”) we entered into with entities affiliated with Deerfield Management Company, L.P. (collectively, “Deerfield”) during February 2013, we issued promissory notes in the aggregate principal amount of $20.5 million (the “Notes”). The Notes bear simple interest at a rate of 8.75% per annum, payable quarterly in arrears commencing on April 1, 2013. In connection with the execution of the Facility Agreement, we issued warrants to purchase an aggregate of 5,500,000 shares of common stock immediately exercisable at an exercise price per share initially equal to $2.63 (the “Warrants”). In addition, the Facility Agreement requires us to maintain consolidated cash and cash equivalents on the last day of each calendar quarter of not less than $2.0 million. As security for our repayment of our obligations under the Facility Agreement, we granted to Deerfield a security interest in substantially all of our property.

The Facility Agreement has a maximum term of seven years from inception; Subsequent to the date of the Facility Agreement, at the election of the holders of Notes representing a majority of the aggregate principal amount of the outstanding Notes, the Notes holders may elect to receive 25% of the net proceeds from any financing that includes an equity component, including without limitation, the sale or issuance of our common stock, options, warrants or other securities convertible or exchangeable for shares of our common stock, as payment of the Notes. This right is subject to certain exceptions set forth in the Facility Agreement, including that the right would not apply until we had issued 15.0 million shares of our common stock following the date of the Facility Agreement. The Notes holders have the option to require us to repay the Notes if we complete a Major Transaction, including a change of control or a sale of all or substantially all of our assets. Additionally, the principal balance of the Facility Agreement may become immediately due and payable upon an event of default, in which case the Notes holders would have the right to require us to repay 100% of the principal amount of the loan, plus any accrued and unpaid interest thereon. The Facility Agreement does not provide for a prepayment of the Notes at our option.

Financing Derivative

A number of features embedded in the Notes to the Facility Agreement required accounting for as a derivative, including the indemnification of certain withholding taxes and the acceleration of debt upon (i) a qualified financing, (ii) an event of default, (iii) a Major Transaction, and (iv) the exercise of the warrant via offset to debt principal. These features represent a single derivative (the “Financing Derivative”) that was bifurcated from the debt instrument and accounted for as a liability at fair value, with changes in fair value between reporting periods recorded in other income (expense), net.

The estimated fair value of the Financing Derivative was determined by comparing the difference between the fair value of the Notes with and without the Financing Derivative by calculating the respective present values from future cash flows using a 13.5% and 19.5% weighted average market yield at December 31, 2015 and December 31, 2014, respectively. The estimated fair value of the Financing Derivative as of December 31, 2015 and December 31, 2014 was $0.6 million and $0.9 million, respectively.

Notes

We initially recorded the Notes and Warrants at $14.1 million and $6.4 million, respectively, based upon the relative fair value allocation of the $20.5 million of proceeds. The carrying value of the Notes at the inception of the debt was $12.8 million, resulting in an original issue discount of $7.7 million. As of December 31, 2015 and December 31, 2014, debt discount of $5.4 million and $6.4 million, respectively, remained to be amortized through February 2020, the maturity of the Notes.

As of December 31, 2015, debt payments, which include interest and principal, are as follows (in thousands):



2016	$	1,799
2017		1,794
2018		5,632
2019		2,817
2020		15,142
Total remaining payments		27,184
Less: interest and discounts		(12,236)
Notes payable		14,948

Commitments And Contingencies

12 Months Ended

Dec. 31, 2015

Commitments And Contingencies [Abstract]

Commitments And Contingencies

NOTE 7. COMMITMENTS AND CONTINGENCIES

Leases

In December 2009 we entered into a lease agreement for a manufacturing and office facility in Menlo Park. In order for the facility to meet our needs and operating requirements, substantial tenant improvements, including improvements to the structural elements and principal operating systems of the facility, were necessary. The lessor provided a tenant improvement allowance of $1.8 million to apply towards the necessary improvements and we remained obligated for additional amounts over the afforded allowance. Due to our involvement in and the nature of the renovations made to the facility and our obligations to fund the costs of renovations exceeding the incentives afforded to us, we account for the facility as if we are the owner. Accordingly we recorded $3.0 million of building and leasehold improvement assets, reflecting the $1.2 million fair value of the facility prior to commencing renovations and the $1.8 million of landlord incentives within property and equipment, net and a corresponding liability recorded to facility financing obligation.

As of December 31, 2015, resulting from the lease amendment agreement described below, future rent expense associated with this lease was reduced to zero with a remaining long-term facility financing obligation of $1.4 million presented as “Other liabilities, non-current” on the consolidated balance sheets as of December 31, 2015.

Lease Amendment Agreement

On July 23, 2015, we entered into a Lease Amendment Agreement (the “Lease Amendment Agreement”) with Peninsula Innovation Partners, LLC (the “Existing Landlord”), which amends the terms and conditions of certain of our existing Menlo Park facility real property leases. The Lease Amendment Agreement provides for, among other things, amendments of the term for certain of the existing leases, the termination of all renewal, expansion and extension rights contained in any of the existing leases with the Existing Landlord (including our options to extend the terms for certain of the existing leases for two consecutive five-year periods), as well as rent abatement for a specified period of time. As consideration for our agreement to amend the existing leases pursuant to the Lease Amendment Agreement, and subject to the terms and conditions contained therein, we became eligible to receive up to four payments of $5.0 million each from the Existing Landlord over time (the “Landlord Payments”), and rent abatement for the remainder of the lease. In the event that we breach any of the leases and fail to cure such breach within the time permitted, the Existing Landlord would have no obligation to make the final $5.0 million payment. On September 1, 2015, the permitting process related to an architectural approval and a change of use permit with respect to our proposed new premises at 1315 O’Brien Drive, Menlo Park, California (the “O’Brien Premises”) was completed, which satisfied the contingencies under the Lease Amendment Agreement. As a result, we recorded $23.0 million in “Gain on lease amendments” in the consolidated statements of operations and comprehensive loss for the year ended December 31, 2015, reflecting that our rent payments were reduced to zero for the remaining term of our existing Menlo Park facility real property leases, the aggregate of $20.0 million in Landlord Payments became receivable and any associated financing obligation was revalued. Of the $20.0 million in Landlord Payments, the first $5.0 million Landlord Payment was received in September 2015, $10.0 million was recorded as a short term receivable in “Prepaid and Other Current Assets” and the final $5.0 million was recorded in “Other Long-term Assets” as of December 31, 2015. We do not believe that there are any remaining performance obligations relating to the remaining Landlord Payments.

In February 2016 we received the second $5.0 million Landlord payment.

O’Brien Lease Agreement

On July 22, 2015, we entered into a new lease agreement (the “O’Brien Lease”) with respect to the O’Brien Premises. The term of the O’Brien Lease is one hundred thirty-two (132) months, commencing on the date that is the later of April 15, 2016 or the date on which the O’Brien Premises landlord has substantially completed certain shell improvements and tenant improvements. Base monthly rent shall be abated for the first six (6) months of the lease term and thereafter will be $540,000 per month during the first year of the lease term, with specified annual increases thereafter until reaching $711,000 per month during the last twelve (12) months of the lease term. We were required to pay $2,160,000 in prepaid rent which will be applied to the monthly rent installments due for the first to fourth months after the rent abatement period. We are also required to prepay $180,000 (or the landlord’s then-current estimate) in operating expenses for the first month of the lease term no later than March 15, 2016. We were also required to establish a deposit of $4.5 million in the form of a letter of credit in October 2015; and, as such, $4.5 million was recorded in “Long-term restricted cash” in the consolidated balance sheet as of December 31, 2015. The landlord is obligated to construct certain shell improvements at the landlord’s cost and expense and provide us with improvement allowances in the amount of $12.6 million.

Under the O’Brien Lease, we expect to pay approximately $80 million in rent and $24 million in operating expenses over the expected lease term. In addition to the lease payments, we are also required to reimburse the landlord for certain improvement costs in excess of the tenant improvement allowances provided. These improvement costs, along with the costs associated with the anticipated move to the O’Brien Premises, are expected to be substantial in nature. These future expenditures are expected to be partially offset by the $15.0 million of future Landlord Payments from our Existing Landlord as described above.

As of December 31, 2015, the future annual minimum lease payments under all noncancelable operating leases with remaining term in excess of one year are as follows (not including the O’Brien Lease described above due to uncertainty associated with the timing and completion of landlord improvements):



	Amount
Years ending December 31,	(in thousands)
2016	$	131
2017		146
2018		112
Total minimum lease payments	$	389

Rent expense for the years ended December 31, 2015, 2014 and 2013, was $1.1 million, $2.2 million and $2.3 million, respectively. We are also required to pay our share of operating expenses with respect to the facilities in which we operate.

In addition, we have other purchase commitments of an estimated amount of approximately $14.4 million consisting of open purchase orders and contractual obligations in the ordinary course of business, including commitments with contract manufacturers and suppliers for which we have not received the goods or services, and acquisition and licensing of intellectual property. A majority of these purchase obligations are due within a year. Although open purchase orders are considered enforceable and legally binding, the terms generally allow us the option to cancel, reschedule and adjust our requirements based on our business needs prior to the delivery of goods or performance of services.

Contingencies

We become subject to claims and assessments from time to time in the ordinary course of business. We accrue liabilities for such matters when it is probable that future expenditures will be made and such expenditures can be reasonably estimated.

We may, from time to time, be party to litigation and subject to claims that arise in the ordinary course of business. In addition, third parties may, from time to time, assert claims against us in the form of letters and other communications. We currently believe that these ordinary course matters will not have a material adverse effect on our business; however, the results of litigation and claims are inherently unpredictable. Regardless of the outcome, litigation can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors.

Indemnification

Pursuant to Delaware law and agreements entered into with each of our directors and officers, we may have obligations, under certain circumstances, to hold harmless and indemnify each of our directors and officers against losses suffered or incurred by the indemnified party in connection with their service to us, and judgments, fines, settlements and expenses related to claims arising against such directors and officers to the fullest extent permitted under Delaware law, our bylaws and certificate of incorporation. We also enter and have entered into indemnification agreements with our directors and officers that may require us to indemnify them against liabilities that arise by reason of their status or service as directors or officers, except as prohibited by applicable law. In addition, we may have obligations to hold harmless and indemnify third parties involved with our fund raising efforts and their respective affiliates, directors, officers, employees, agents or other representatives against any and all losses, claims, damages and liabilities related to claims arising against such parties pursuant to the terms of agreements entered into between such third parties and us in connection with such fund raising efforts. To the extent that any such indemnification obligations apply to the lawsuits described above, any associated expenses incurred are included within the related accrued litigation expense amounts. No additional liability associated with such indemnification obligations has been recorded at December 31, 2015.

- Definition

The entire disclosure for loss and gain contingencies. Describes any existing condition, situation, or set of circumstances involving uncertainty as of the balance sheet date (or prior to issuance of the financial statements) as to a probable or reasonably possible loss incurred by an entity that will ultimately be resolved when one or more future events occur or fail to occur, and typically discloses the amount of loss recorded or a range of possible loss, or an assertion that no reasonable estimate can be made.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14453-108349

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14615-108349

+ Details

Income Taxes

12 Months Ended

Dec. 31, 2015

Income Taxes [Abstract]

Income Taxes

NOTE 8. INCOME TAXES

A reconciliation between the statutory federal income tax and our effective tax rates as a percentage of loss before income taxes are as follows:



	Years ended December 31,
	2015		2014		2013
Statutory tax rate	35.0	%	35.0	%	35.0	%
State tax rate, net of federal benefit	(3.5)		3.8		2.1
Stock-based compensation	(4.0)		(1.3)		(1.7)
R&D credit	11.0		4.0		4.3
Other	(0.6)		(0.0)		(0.3)
Change in valuation allowance	(37.9)		(41.5)		(39.4)
Effective income tax rate	0.0	%	0.0	%	0.0	%

Temporary differences and carryforwards that gave rise to significant portions of deferred taxes are as follows (in thousands):



	December 31,
Deferred tax assets:	2015		2014
Net operating loss carryforwards	$	235,659	$	225,115
Research and development credits		28,346		24,881
Depreciation		1,403		3,241
Accruals and reserves		20,385		21,737
Total deferred tax assets		285,793		274,974
Less: Valuation allowance		(285,556)		(273,567)
Deferred tax liabilities:
Deferred rent		(237)		(1,407)
Net deferred tax assets	$	—	$	—

Due to uncertainties surrounding the realization of deferred tax assets through future taxable income, we have provided a full valuation allowance and, therefore, have not recognized any benefits from net operating losses and other deferred tax assets.

Recognition of deferred tax assets is appropriate when realization of such assets is more likely than not. Based upon the weight of available evidence, we believe it is more likely than not that the net deferred tax assets will not be fully realizable. Accordingly, we have provided a full valuation allowance against our net deferred tax assets as of December 31, 2015 and 2014, respectively.

For the year ended December 31, 2015, our valuation allowance increased to $285.6 million primarily because of an increase in deferred tax assets related to net operating losses, state research and development tax credits, and changes in accruals and reserves. For the year ended December 31, 2014, our valuation allowance increased to $273.6 million primarily because of an increase in deferred tax assets related to net operating losses, state tax credits, and changes in accruals and reserves.

As of December 31, 2015, we had federal and state net operating loss carryforwards of approximately $612.9 million and $523.4 million, respectively, available to reduce future taxable income, if any. The federal net operating loss carryforward begins expiring in 2024, and the state net operating loss carryforward have expiration in 2015 and beyond.

We also had federal and California state research and development credit carryforwards of approximately $23.9 million and $25.6 million, respectively, as of December 31, 2015. The federal research and development credits begin expiring in 2024 if not utilized. The California tax research and development credits can be carried forward indefinitely.

Tax attributes related to stock option windfall deductions are not recorded until they result in a reduction of cash tax payable. The tax effected benefit of the excess tax deductions for federal and state purposes of $4.9 million and $0.6 million, respectively, will be recorded to additional paid-in capital when they reduce cash taxes payable.

The Tax Reform Act of 1986 limits the use of net operating loss and tax credit carryforwards in certain situations where equity transactions result in a change of ownership as defined by Internal Revenue Code Section 382. In the event we experience an additional ownership change for tax purposes, utilization of our United States net operating loss and tax credit carryforwards could be limited.

As of December 31, 2015, our total unrecognized tax benefit was $18.7 million, of which none of the tax benefit, if recognized, would affect the effective income tax rate due to the valuation allowance that currently offsets deferred tax assets. We do not anticipate the total amount of unrecognized income tax benefits to significantly increase or decrease in the next 12 months.

A reconciliation of the beginning and ending unrecognized tax benefit accounts is as follows (in thousands):



Balance as of December 31, 2012	$	9,992
Increase in balance related to tax positions taken during current year		1,642
Balance as of December 31, 2013		11,634
Increase in balance related to tax positions taken in prior year		2,959
Increase in balance related to tax positions taken during current year		2,359
Balance as of December 31, 2014		16,952
Decrease in balance related to tax positions taken in prior year		(44)
Increase in balance related to tax positions taken during current year		1,827
Balance as of December 31, 2015	$	18,735

Our practice is to recognize interest and/or penalties related to income tax matters in income tax expense. As of December 31, 2015 and 2014, we had no accrued interest or penalties due to our net operating losses available to offset any tax adjustment. We file U.S. federal and various state income tax returns. For U.S. federal and state income tax purposes, the statute of limitations currently remains open for the years ending December 31, 2012 to present and December 31, 2011 to present, respectively. In addition, all of the net operating losses and research and development credit carryforwards that may be utilized in future years may be subject to examination. We are not currently under examination by income tax authorities in any jurisdiction.

Stockholders' Equity

12 Months Ended

Dec. 31, 2015

Stockholders' Equity [Abstract]

Stockholders' Equity

NOTE 9. STOCKHOLDERS’ EQUITY

Preferred Stock

Our Certificate of Incorporation, as amended and restated in October 2010 in connection with the closing of our initial public offering, authorizes us to issue 1,000,000,000 shares of $0.001 par value common stock and 50,000,000 shares of $0.001 par value preferred stock. As of December 31, 2015 and 2014, there were no shares of preferred stock issued or outstanding.

Common Stock

Common stockholders are entitled to dividends when and if declared by our board of directors. There have been no dividends declared to date. The holder of each share of common stock is entitled to one vote.

On October 5, 2012, we entered into a sales agreement pursuant to which we sold shares of our common stock having an aggregate offering price of approximately $30.0 million through an “at-the-market” offering. On November 8, 2013, the sales agreement was amended to increase the shares of our common stock available for sale pursuant to the sales agreement, and, pursuant to such amendment, we sold an additional aggregate offering price of approximately $30.0 million. On February 3, 2015, the sales agreement was amended again in order to further increase the shares of our common stock available for sale pursuant to the sales agreement, and, pursuant to such amendment we sold an additional aggregate offering price of approximately $30.0 million. On February 3, 2016 we filed a prospectus supplement pursuant to which we may offer and sell, from time to time, additional shares of our common stock having an aggregate offering price of up to $30.0 million under the sales agreement. Such aggregate offering price of shares of our common stock is in addition to the shares sold under the original sales agreement, dated October 5, 2012, the first amendment to such sales agreement, dated November 8, 2013, and amounts previously sold under the second amendment to such sales agreement, dated February 3, 2015. We will pay a commission equal to 3% of the gross proceeds from the sale of shares of our common stock under the sales agreement. We are not obligated to make any sales of shares of our common stock under the sales agreement. In the year ended December 31, 2015, we issued 4.1 million shares of our common stock at an average price of $7.36 per share through our “at-the-market” offering.

From January 1, 2016 to March 7, 2016, we issued 2.7 million shares of our common stock at an average price of $8.79 per share through our “at-the-market” offering, resulting in net proceeds of $23.4 million.

Subject to certain exceptions set forth in our existing Facility Agreement, holders of our Notes may elect to receive 25% of the net proceeds from financing activities that include an equity component as prepayment of the Notes to be applied first, to accrued and unpaid interest and second, to principal. However, in February 2016 holders representing a majority of the aggregate principal amount of the outstanding Notes waived such right in connection with the issuance and sale of shares of common stock under our current “at-the-market” offering.

Warrants

In connection with the execution of the Facility Agreement, we issued immediately exercisable warrants to purchase 5,500,000 shares of common stock at an exercise price per share initially equal to $2.63, all of which were outstanding at December 31, 2015. The number of shares of common stock into which the warrants are exercisable and the exercise price will be adjusted to reflect any stock splits, payment of stock dividends, recapitalizations, reclassifications or other similar adjustments in the number of outstanding shares of common stock. The exercise price may also be adjusted to reflect certain dividends or other distributions, including distributions of stock or other securities, property or options by way of a dividend, spin off, reclassification, corporate rearrangement or similar transaction.

From January 1, 2016 to March 7, 2016, warrants to purchase 3,818,000 shares of common stock were exercised. As of March 7, 2016, we had outstanding exercisable warrants to purchase an aggregate of 1,682,000 shares of common stock at $2.63 per share.

Equity Plans

As of December 31, 2015, we had three active equity plans, the 2010 Equity Incentive Plan, or “2010 Plan”, the 2010 Outside Director Equity Incentive Plan, or “2010 Director Plan”, and the 2010 Employee Stock Purchase Plan or “ESPP”, all of which we adopted upon the effectiveness of our initial public offering in October 2010. Prior to the adoption of these plans, we granted options pursuant to the 2004 Equity Incentive Plan and 2005 Stock Plan. Upon termination of the predecessor plans, the shares available for grant at the time of termination, and shares subsequently returned to the plans upon forfeiture or option termination, were transferred to the successor plan in effect at the time of share return.

We issue new shares of common stock upon the exercise of stock options.

2010 Equity Incentive Plan and Outside Director Equity Incentive Plan

Stock options granted under the 2010 Plan may be either Incentive Stock Option (“ISO”) or Non-Qualified Stock Option (“NSO”). ISOs may be granted only to employees. NSOs may be granted to employees, consultants and directors. Stock options under the 2010 Plan may be granted with a term of up to ten years and at prices no less than the fair market value of our common stock on the date of grant. To date, stock options granted to existing employees generally vest over four years on a monthly basis and stock options granted to new employees vest at a rate of 25% upon the first anniversary of the vesting commencement date and 1/48th per month thereafter. In January 2016, an additional 4.0 million shares were reserved under the 2010 Plan.

Stock options granted under the 2010 Director Plan provide for the grant of NSOs. Stock options under the 2010 Plan may be granted with a term of up to ten years and at prices no less than the fair market value of our common stock on the date of grant. To date, stock options granted to existing directors generally vest over one year on a monthly basis and stock options granted to new directors generally vest over three years at a rate of one-third upon the first anniversary of the vesting commencement date and 1/36th per month thereafter. In January 2016, an additional 0.8 million shares were reserved under the 2010 Director Plan.

As of December 31, 2015 we had an aggregate of 5.5 million shares of common stock reserved for future issuance under the 2010 Plan and 2010 Director Plan.

2010 Employee Stock Purchase Plan

We adopted the ESPP in October 2010. Our ESPP permits eligible employees to purchase common stock at a discount through payroll deductions during defined offering periods. Each offering period will generally consist of four purchase periods, each purchase period being approximately six months. The price at which the stock is purchased is equal to the lower of 85% of the fair market value of the common stock at the beginning of an offering period or at the end of a purchase period. Each offering period will generally end and the shares will be purchased twice yearly on March 1 and September 1. If the stock price at the end of the purchase period is lower than the stock price at the beginning of the offering period, that offering period will then be terminated and new offering period comes to place. As of December 31, 2015, 397,633 shares of our common stock remain available for issuance under the Plan. The ESPP provides for an annual increase to the shares available for issuance at the beginning of each calendar year equal to 2% of the common shares then outstanding. During January 2016, an additional 1.6 million shares were reserved under the ESPP.

The following table summarizes stock option activity for all stock option plans for the year ended December 31, 2015 (in thousands, except per share amounts):



		Stock Options Outstanding
	Shares available	Number			Weighted average
	for grant	of shares	Exercise price		exercise price
Balances, December 31, 2014	4,874	16,491	$	0.70 – 16.00	$	5.10
Additional shares reserved	4,799
Options granted	(4,500)	4,500	$	4.55 – 10.07	$	7.51
Options exercised	—	(882)	$	0.70 – 10.84	$	3.27
Options canceled	641	(641)	$	1.16 – 15.98	$	6.60
Balances, December 31, 2015	5,814	19,468	$	0.70 – 16.00	$	5.69

The following table summarizes information with respect to stock options outstanding and exercisable under the plans at December 31, 2015:



		Options Outstanding				Options Exercisable
			Weighted average
		Number	remaining contractual	Weighted average		Number	Weighted average
Exercise price		outstanding	life (Years)	exercise price		vested	exercise price
$	0.00 – 1.60	827,488	6.75	$	1.17	502,194	$	1.17
$	1.60 – 3.20	3,802,953	6.04	$	2.42	2,978,692	$	2.47
$	3.20 – 4.80	4,226,360	6.66	$	4.10	2,947,959	$	4.07
$	4.80 – 6.40	3,486,254	8.23	$	5.65	1,288,411	$	5.68
$	6.40 – 8.00	3,264,464	7.97	$	6.98	1,229,713	$	6.97
$	8.00 – 9.60	1,088,077	4.10	$	8.50	1,088,077	$	8.50
$	9.60 – 11.20	1,627,201	9.15	$	10.18	246,501	$	10.79
$	11.20 – 12.80	621,077	5.08	$	12.10	592,344	$	12.12
$	12.80 – 14.40	386,100	5.00	$	13.87	378,102	$	13.87
$	14.40 – 16.00	137,750	4.86	$	15.99	137,750	$	15.99
		19,467,724	7.01	$	5.69	11,389,743	$	5.47

The aggregate intrinsic value of the outstanding and exercisable options presented in the table above totaled $145.4 million and $87.8 million, respectively. The aggregate intrinsic value represents the total pretax intrinsic value (i.e., the difference between $13.13, our closing stock price on the last trading day of our fourth quarter of 2015 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their options on December 31, 2015. The aggregate intrinsic value changes at each reporting date based on the fair market value of our common stock. The weighted average remaining contractual life for exercisable options is 5.95 years.

The total intrinsic value of stock options exercised during the years ended December 31, 2015, 2014 and 2013 was $3.5 million, $2.0 million and $0.5 million, respectively.

The total fair value of stock options vested during the years ended December 31, 2015, 2014 and 2013 was $7.3 million, $6.0 million and $6.5 million, respectively.

Stock-based Compensation

Total stock-based compensation expense consists of the following (in thousands):



	Years Ended December 31,
	2015		2014		2013
Cost of revenue	$	1,313	$	758	$	523
Research and development		5,196		3,785		4,052
Sales, general and administrative		7,331		5,400		5,330
Total stock-based compensation expense	$	13,840	$	9,943	$	9,905

As of December 31, 2015 and December 31, 2014, $315,000 and $225,000 of stock-based compensation cost was capitalized in inventory on our consolidated balance sheets, respectively.

The tax benefit of stock-based compensation expense was immaterial for the years ended December 31, 2015, 2014 and 2013.

Stock Options

We estimated the fair value of employee stock option using the Black-Scholes option pricing model. The fair value of employee stock options is being amortized on a straight-line basis over the requisite service period of the awards. For the years ended December 31, 2015, 2014 and 2013, the weighted average fair value at grant date per stock option was $4.75, $3.81 and $1.80, respectively. We recorded stock-based compensation expense for stock options of $10.2 million, $7.8 million and $7.0 million for the years ended December 31, 2015, 2014 and 2013, respectively.

For the years ended December 31, 2015, 2014 and 2013, the fair value of employee stock options was estimated using the following weighted average assumptions:



	Years Ended December 31,
	2015		2014		2013
Expected term (years)		6.1 years		6.1 years		6.1 years
Expected volatility		70.0%		70.0%		66.8%
Risk-free interest rate		1.7%		1.9%		1.3%
Dividend yield		—		—		—

As of December 31, 2015, $20.7 million of total unrecognized compensation expense related to stock options was expected to be recognized over a weighted-average period of 3.0 years. Future option grants will increase the amount of compensation expense to be recorded in those future periods. Cash received from option exercises for the years ended December 31, 2015, 2014 and 2013 was $3.0 million, $1.6 million and $0.5 million, respectively.

ESPP

We estimated the fair value of ESPP using the Black-Scholes option pricing model. For the years ended December 31, 2015, 2014 and 2013, weighted average fair value at grant date for ESPP was $2.20, $2.98 and $1.76, respectively. We recorded stock-based compensation expense for ESPP of $3.6 million, 2.1 million and $2.8 million for the years ended December 31, 2015, 2014 and 2013, respectively.

For the years ended December 31, 2015, 2014 and 2013, the fair value of ESPP was estimated using the following assumptions:



	Years Ended December 31,
	2015		2014		2013
Expected term (years)		0.5 - 2.0		0.5 - 2.0		0.5 - 2.0
Expected volatility		70.0%		70.0%		70.0%
Risk-free interest rate		0.1%-0.7%		0.1%-0.5%		0.1%-0.4%
Dividend yield		—		—		—

For the years ended December 31, 2015, 2014 and 2013, 1.1 million shares, 1.3 million shares and 1.5 million shares of common stock were purchased under the ESPP, respectively. Cash received through the ESPP for the years ended December 31, 2015, 2014 and 2013 was $4.4 million, $2.3 million and $2.6 million, respectively.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Net Loss Per Share

12 Months Ended

Dec. 31, 2015

Net Loss Per Share [Abstract]

Net Loss Per Share

NOTE 10. NET LOSS PER SHARE

The following table presents the computation of basic and diluted net loss per share (in thousands, except per share amounts):



	Years Ended December 31,
	2015		2014		2013
Numerator:
Net loss	$	(31,696)	$	(66,160)	$	(79,293)
Denominator:
Weighted average shares used in computation of basic and diluted net loss per share		75,614		70,475		62,784
Basic and diluted net loss per share	$	(0.42)	$	(0.94)	$	(1.26)

The following options outstanding and warrants to purchase common stock were excluded from the computation of diluted net loss per share for the periods presented because the effect of including such shares would have been antidilutive in the periods presented:



	Years Ended December 31,
(in thousands)	2015	2014	2013
Options outstanding	19,468	16,491	14,070
Warrants to purchase common stock	5,500	5,500	5,500

Segment And Geographic Information

12 Months Ended

Dec. 31, 2015

Segment And Geographic Information [Abstract]

Segment And Geographic Information

NOTE 11. SEGMENT AND GEOGRAPHIC INFORMATION

We are organized as, and operate in, one reportable segment: the development, manufacturing and marketing of an integrated platform for genetic analysis. Our chief operating decision-maker is our Chief Executive Officer. The Chief Executive Officer reviews financial information presented on a consolidated basis for purposes of evaluating financial performance and allocating resources, accompanied by information about revenue by geographic regions. Our assets are primarily located in the United States of America and not allocated to any specific region and we do not measure the performance of geographic regions based upon asset-based metrics. Therefore, geographic information is presented only for revenue. Revenue by geographic region is based on the ship to address on the customer order.

A summary of our revenue by geographic location for the years ended December 31, 2015, 2014 and 2013 is as follows, with Roche related contractual revenue classified as revenue from the United States:



	Years Ended December 31,
(in millions)	2015		2014		2013
North America	$	68.8	$	34.8	$	13.6
Europe		9.0		10.1		9.2
Asia		15.0		15.7		5.4
Total	$	92.8	$	60.6	$	28.2

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599

+ Details

Unaudited Selected Quarterly Financial Data

12 Months Ended

Dec. 31, 2015

Unaudited Selected Quarterly Financial Data [Abstract]

Unaudited Selected Quarterly Financial Data

NOTE 12. UNAUDITED SELECTED QUARTERLY FINANCIAL DATA

The following tables summarize the unaudited quarterly financial data for the last two fiscal years:



	Fiscal 2015 Quarter Ended
(in thousands, except per share data)	March 31,		June 30,			September 30,			December 31,
Total revenue	$	17,645	$	24,939	(1)	$	13,917		$	36,281	(1)
Total gross profit		5,927		14,506			6,551			26,466
Total operating expenses		25,255		25,864			3,937	(2)		27,528
Income (loss) from operations		(19,328)		(11,358)			2,614	(2)		(1,062)
Net income (loss)		(20,173)		(11,935)			1,821	(2)		(1,409)
Net income (loss) per share
Basic	$	(0.27)	$	(0.16)		$	0.02	(2)	$	(0.02)
Diluted	$	(0.27)	$	(0.16)		$	0.02	(2)	$	(0.02)

	Fiscal 2014 Quarter Ended
	March 31,		June 30,			September 30,			December 31,
Total revenue	$	11,642	$	11,425		$	20,623	(1)	$	16,904
Total gross profit		2,676		3,126			13,162			4,438
Total operating expenses		20,921		21,428			21,575			22,332
Loss from operations		(18,245)		(18,302)			(8,413)			(17,894)
Net loss		(18,886)		(19,136)			(9,163)			(18,975)
Basic and diluted net loss per share	$	(0.28)	$	(0.27)		$	(0.13)		$	(0.26)

(1)

During the third quarter ended September 30, 2014, we achieved the first development milestone as provided in the Roche Agreement and we recognized the related $10.0 million as contractual revenue. We achieved the second and third (final) development milestones and recognized the related $10.0 million and $20.0 million, respectively, as contractual revenue during the quarters ended June 30, 2015 and December 31, 2015, respectively. See “Note 3. Contractual revenue” for additional information.

(2)

For the quarter ended September 30, 2015, we recognized a one-time gain on lease amendments of $23.0 million, which was recorded in operating expenses on our statement of operations and comprehensive income (loss) for the period. See “Note 7. Commitments and contingencies” for additional information.

Summary Of Significant Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2015

Summary Of Significant Accounting Policies [Abstract]

Basis Of Presentation And Consolidation

Basis of Presentation and Consolidation

Use Of Estimates

Use of Estimates

Fair Value Of Financial Instruments

Fair Value of Financial Instruments

•

Level 1: quoted prices in active markets for identical assets or liabilities;

•

Level 3: unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table sets forth the fair value of our financial assets and liabilities that were measured on a recurring basis as of December 31, 2015 and 2014, respectively (in thousands):



	December 31, 2015								December 31, 2014
(in thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets
Cash and cash equivalents:
Cash and money market funds	$	22,034	$	—	$	—	$	22,034	$	21,952	$	—	$	—	$	21,952
Commercial paper		—		8,595		—		8,595		—		14,497		—		14,497
US government & agency securities		—		3,000		—		3,000		—		—		—		—
Total cash and cash equivalents		22,034		11,595		—		33,629		21,952		14,497		—		36,449
Investments:
Commercial paper		—		15,903		—		15,903		—		43,653		—		43,653
Corporate debt securities		—		1,265		—		1,265		—		8,173		—		8,173
US government & agency securities		—		28,136		—		28,136
Asset backed securities		—		3,337		—		3,337		—		13,073		—		13,073
Total investments		—		48,641		—		48,641		—		64,899		—		64,899
Long-term restricted cash:
Cash		4,500		—		—		4,500		—		—		—		—
Total assets measured at fair value	$	26,534	$	60,236	$	—	$	86,770	$	21,952	$	79,396	$	—	$	101,348

Liabilities
Financing derivative	$	—	$	—	$	600	$	600	$	—	$	—	$	944	$	944
Total liabilities measured at fair value	$	—	$	—	$	600	$	600	$	—	$	—	$	944	$	944

The following table provides the changes in the fair value of the Financial Derivative for the year ended December 31, 2015 and 2014 (in thousands), respectively.



Financing Derivative	Amount
Balance as of December 31, 2013	$	549
Loss on change in fair value of Financing Derivative		395
Balance as of December 31, 2014		944
Gain on change in fair value of Financing Derivative		(344)
Balance as of December 31, 2015	$	600

Financial Assets and Liabilities Not Measured at Fair Value on a Recurring Basis



	December 31, 2015				December 31, 2014
	Fair Value		Carrying Value		Fair Value		Carrying Value
Long-term notes payable	$	18,037	$	14,948	$	14,817	$	13,991

Cash And Cash Equivalents

Cash and Cash Equivalents

We consider all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents.

Investments

Concentration Of Credit Risk

Concentration of Credit Risk

For the year ended December 31, 2015, 2014 and 2013, excluding contractual revenue, no single end customer accounted for more than 10% of our total revenue, respectively.

Inventory

Property And Equipment, Net

Property and Equipment, Net

Long-Term Restricted Cash

Long-term Restricted Cash

Impairment Of Long-Lived Assets

Impairment of Long-Lived Assets

Revenue Recognition

Deferred service revenue primarily represents product maintenance agreement revenue that is expected to be recognized over the related service period, generally one to three years.

Cost Of Revenue

Cost of Revenue

Research And Development

Research and Development

Leases

Income Taxes

Stock-Based Compensation

Stock-based Compensation

Other Comprehensive Income (Loss)

Other Comprehensive Income (loss)

Other comprehensive income (loss) is comprised of unrealized gains (losses) on our investment securities.

Recent Accounting Pronouncements

Recently Adopted Accounting Standards


	December 31, 2015						December 31, 2014
(in thousands)	Prior to Adoption of ASU 2015-03		ASU 2015-03 Adjustment		As adopted		Prior to Adoption of ASU 2015-03		ASU 2015-03 Adjustment		As adopted

Other long-term assets	$	7,631	$	(113)	$	7,518	$	162	$	(133)	$	29
Total assets		7,631		(113)		7,518		162		(133)		29

Notes payable		15,061		(113)		14,948		14,124		(133)		13,991
Total liabilities	$	15,061	$	(113)	$	14,948	$	14,124	$	(133)	$	13,991

Recently Issued Accounting Standards

Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Summary Of Significant Accounting Policies [Abstract]

Summary Of Assets And Liabilities Measured At Fair Value Classified Based On Level Of Input



	December 31, 2015								December 31, 2014
(in thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets
Cash and cash equivalents:
Cash and money market funds	$	22,034	$	—	$	—	$	22,034	$	21,952	$	—	$	—	$	21,952
Commercial paper		—		8,595		—		8,595		—		14,497		—		14,497
US government & agency securities		—		3,000		—		3,000		—		—		—		—
Total cash and cash equivalents		22,034		11,595		—		33,629		21,952		14,497		—		36,449
Investments:
Commercial paper		—		15,903		—		15,903		—		43,653		—		43,653
Corporate debt securities		—		1,265		—		1,265		—		8,173		—		8,173
US government & agency securities		—		28,136		—		28,136
Asset backed securities		—		3,337		—		3,337		—		13,073		—		13,073
Total investments		—		48,641		—		48,641		—		64,899		—		64,899
Long-term restricted cash:
Cash		4,500		—		—		4,500		—		—		—		—
Total assets measured at fair value	$	26,534	$	60,236	$	—	$	86,770	$	21,952	$	79,396	$	—	$	101,348

Liabilities
Financing derivative	$	—	$	—	$	600	$	600	$	—	$	—	$	944	$	944
Total liabilities measured at fair value	$	—	$	—	$	600	$	600	$	—	$	—	$	944	$	944

Changes In Fair Value Of Financial Derivative



Financing Derivative	Amount
Balance as of December 31, 2013	$	549
Loss on change in fair value of Financing Derivative		395
Balance as of December 31, 2014		944
Gain on change in fair value of Financing Derivative		(344)
Balance as of December 31, 2015	$	600

Estimated Fair Value And Carrying Value of Notes



	December 31, 2015				December 31, 2014
	Fair Value		Carrying Value		Fair Value		Carrying Value
Long-term notes payable	$	18,037	$	14,948	$	14,817	$	13,991

Impact Of Early Adoption On Consolidated Balance Sheets


	December 31, 2015						December 31, 2014
(in thousands)	Prior to Adoption of ASU 2015-03		ASU 2015-03 Adjustment		As adopted		Prior to Adoption of ASU 2015-03		ASU 2015-03 Adjustment		As adopted

Other long-term assets	$	7,631	$	(113)	$	7,518	$	162	$	(133)	$	29
Total assets		7,631		(113)		7,518		162		(133)		29

Notes payable		15,061		(113)		14,948		14,124		(133)		13,991
Total liabilities	$	15,061	$	(113)	$	14,948	$	14,124	$	(133)	$	13,991

Cash And Cash Equivalents And Investments (Tables)

12 Months Ended

Dec. 31, 2015

Cash And Cash Equivalents And Investments [Abstract]

Summary Of Cash, Cash Equivalents And Investments



	As of December 31, 2015
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	Cost		gains		losses		Value
Cash and cash equivalents:
Cash and money market funds	$	22,034	$	—	$	—	$	22,034
Commercial paper		8,595		—		—		8,595
US government & agency securities		3,000		—		—		3,000
Total cash and cash equivalents		33,629		—		—		33,629
Investments:
Commercial paper		15,903		2		(2)		15,903
Corporate debt securities		1,266		—		(1)		1,265
Asset backed securities		3,337		—		—		3,337
US government & agency securities		28,142		4		(10)		28,136
Total investments		48,648		6		(13)		48,641
Long-term restricted cash:
Cash		4,500		—		—		4,500
Total cash, cash equivalents and investments	$	82,277	$	6	$	(13)	$	82,270
Total Long-term restricted cash	$	4,500	$	—	$	—	$	4,500

	As of December 31, 2014
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	Cost		gains		losses		Value
Cash and cash equivalents:
Cash and money market funds	$	21,952	$	—	$	—	$	21,952
Commercial paper		14,496		1		—		14,497
Total cash and cash equivalents		36,448		1		—		36,449
Investments:
Commercial paper		43,648		5		—		43,653
Corporate debt securities		8,170		7		(4)		8,173
Asset backed securities		13,073		4		(4)		13,073
Total investments		64,891		16		(8)		64,899
Total cash, cash equivalents and investments	$	101,339	$	17	$	(8)	$	101,348

Summary Of Contractual Maturities Of Cash Equivalents And Available-For-Sale Investments



(in thousands)	Fair Value
Due in one year or less	$	60,236

Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2015

Balance Sheet Components [Abstract]

Components Of Inventory



	December 31,
(in thousands)	2015		2014
Purchased materials	$	4,041	$	3,150
Work in process		3,576		6,115
Finished goods		3,338		2,070
Inventory	$	10,955	$	11,335

Components Of Prepaid Expenses And Other Current Assets


	December 31,
(in thousands)	2015		2014
Receivable from existing landlord	$	10,000	$	—
Prepaid expenses		1,330		1,564
Other current assets		741		107
Prepaid expenses and other current assets	$	12,071	$	1,671

Components Of Property And Equipment, Net



	December 31,
(in thousands)	2015		2014
Building	$	1,160	$	1,160
Laboratory equipment and machinery		20,358		17,169
Leasehold improvements		8,348		8,348
Computer equipment		6,781		4,885
Software		4,798		4,485
Furniture and fixtures		968		958
Construction in progress		—		53
		42,413		37,058
Less: Accumulated depreciation		(33,865)		(30,457)
Property and equipment, net	$	8,548	$	6,601

Schedule Of Accrued Expenses



	December 31,
(in thousands)	2015		2014
Salaries and benefits	$	8,129	$	6,325
Accrued license and development services		5,459		3,741
Inventory accrual, professional services, accrued interest and other		1,963		1,375
Accrued expenses	$	15,551	$	11,441

Notes Payable (Tables)

12 Months Ended

Dec. 31, 2015

Notes Payable [Abstract]

Schedule Of Debt Payments



2016	$	1,799
2017		1,794
2018		5,632
2019		2,817
2020		15,142
Total remaining payments		27,184
Less: interest and discounts		(12,236)
Notes payable		14,948

Commitments And Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments And Contingencies [Abstract]

Schedule Of Minimum Future Lease Payments Receivable



	Amount
Years ending December 31,	(in thousands)
2016	$	131
2017		146
2018		112
Total minimum lease payments	$	389

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Taxes [Abstract]

Reconciliation Of Federal Income Tax Rate



	Years ended December 31,
	2015		2014		2013
Statutory tax rate	35.0	%	35.0	%	35.0	%
State tax rate, net of federal benefit	(3.5)		3.8		2.1
Stock-based compensation	(4.0)		(1.3)		(1.7)
R&D credit	11.0		4.0		4.3
Other	(0.6)		(0.0)		(0.3)
Change in valuation allowance	(37.9)		(41.5)		(39.4)
Effective income tax rate	0.0	%	0.0	%	0.0	%

Reconciliation Of Deferred Tax Assets And Liabilities



	December 31,
Deferred tax assets:	2015		2014
Net operating loss carryforwards	$	235,659	$	225,115
Research and development credits		28,346		24,881
Depreciation		1,403		3,241
Accruals and reserves		20,385		21,737
Total deferred tax assets		285,793		274,974
Less: Valuation allowance		(285,556)		(273,567)
Deferred tax liabilities:
Deferred rent		(237)		(1,407)
Net deferred tax assets	$	—	$	—

Reconciliation Of Unrecognized Tax Benefit Accounts



Balance as of December 31, 2012	$	9,992
Increase in balance related to tax positions taken during current year		1,642
Balance as of December 31, 2013		11,634
Increase in balance related to tax positions taken in prior year		2,959
Increase in balance related to tax positions taken during current year		2,359
Balance as of December 31, 2014		16,952
Decrease in balance related to tax positions taken in prior year		(44)
Increase in balance related to tax positions taken during current year		1,827
Balance as of December 31, 2015	$	18,735

Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Stockholders' Equity [Line Items]

Summary Of Stock Option Activity



		Stock Options Outstanding
	Shares available	Number			Weighted average
	for grant	of shares	Exercise price		exercise price
Balances, December 31, 2014	4,874	16,491	$	0.70 – 16.00	$	5.10
Additional shares reserved	4,799
Options granted	(4,500)	4,500	$	4.55 – 10.07	$	7.51
Options exercised	—	(882)	$	0.70 – 10.84	$	3.27
Options canceled	641	(641)	$	1.16 – 15.98	$	6.60
Balances, December 31, 2015	5,814	19,468	$	0.70 – 16.00	$	5.69

Reconciliation Of Outstanding And Exercisable Stock Options



		Options Outstanding				Options Exercisable
			Weighted average
		Number	remaining contractual	Weighted average		Number	Weighted average
Exercise price		outstanding	life (Years)	exercise price		vested	exercise price
$	0.00 – 1.60	827,488	6.75	$	1.17	502,194	$	1.17
$	1.60 – 3.20	3,802,953	6.04	$	2.42	2,978,692	$	2.47
$	3.20 – 4.80	4,226,360	6.66	$	4.10	2,947,959	$	4.07
$	4.80 – 6.40	3,486,254	8.23	$	5.65	1,288,411	$	5.68
$	6.40 – 8.00	3,264,464	7.97	$	6.98	1,229,713	$	6.97
$	8.00 – 9.60	1,088,077	4.10	$	8.50	1,088,077	$	8.50
$	9.60 – 11.20	1,627,201	9.15	$	10.18	246,501	$	10.79
$	11.20 – 12.80	621,077	5.08	$	12.10	592,344	$	12.12
$	12.80 – 14.40	386,100	5.00	$	13.87	378,102	$	13.87
$	14.40 – 16.00	137,750	4.86	$	15.99	137,750	$	15.99
		19,467,724	7.01	$	5.69	11,389,743	$	5.47

Schedule Of Stock-Based Compensation Expense



	Years Ended December 31,
	2015		2014		2013
Cost of revenue	$	1,313	$	758	$	523
Research and development		5,196		3,785		4,052
Sales, general and administrative		7,331		5,400		5,330
Total stock-based compensation expense	$	13,840	$	9,943	$	9,905

Stock Options [Member]

Stockholders' Equity [Line Items]

Schedule Of Fair Value Of Employee Stock Options



	Years Ended December 31,
	2015		2014		2013
Expected term (years)		6.1 years		6.1 years		6.1 years
Expected volatility		70.0%		70.0%		66.8%
Risk-free interest rate		1.7%		1.9%		1.3%
Dividend yield		—		—		—

ESPP [Member]

Stockholders' Equity [Line Items]

Schedule Of Fair Value Of Employee Stock Options



	Years Ended December 31,
	2015		2014		2013
Expected term (years)		0.5 - 2.0		0.5 - 2.0		0.5 - 2.0
Expected volatility		70.0%		70.0%		70.0%
Risk-free interest rate		0.1%-0.7%		0.1%-0.5%		0.1%-0.4%
Dividend yield		—		—		—

Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Net Loss Per Share [Abstract]

Computation Of Basic And Diluted Net Loss Per Share



	Years Ended December 31,
	2015		2014		2013
Numerator:
Net loss	$	(31,696)	$	(66,160)	$	(79,293)
Denominator:
Weighted average shares used in computation of basic and diluted net loss per share		75,614		70,475		62,784
Basic and diluted net loss per share	$	(0.42)	$	(0.94)	$	(1.26)

Anti-Dilutive Shares Excluded From Computation Of Diluted Net Loss Per Share



	Years Ended December 31,
(in thousands)	2015	2014	2013
Options outstanding	19,468	16,491	14,070
Warrants to purchase common stock	5,500	5,500	5,500

Segment And Geographic Information (Tables)

12 Months Ended

Dec. 31, 2015

Segment And Geographic Information [Abstract]

Schedule Of Revenue By Geographic Location



	Years Ended December 31,
(in millions)	2015		2014		2013
North America	$	68.8	$	34.8	$	13.6
Europe		9.0		10.1		9.2
Asia		15.0		15.7		5.4
Total	$	92.8	$	60.6	$	28.2

Unaudited Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2015

Unaudited Selected Quarterly Financial Data [Abstract]

Schedule Of Unaudited Quarterly Financial Data



	Fiscal 2015 Quarter Ended
(in thousands, except per share data)	March 31,		June 30,			September 30,			December 31,
Total revenue	$	17,645	$	24,939	(1)	$	13,917		$	36,281	(1)
Total gross profit		5,927		14,506			6,551			26,466
Total operating expenses		25,255		25,864			3,937	(2)		27,528
Income (loss) from operations		(19,328)		(11,358)			2,614	(2)		(1,062)
Net income (loss)		(20,173)		(11,935)			1,821	(2)		(1,409)
Net income (loss) per share
Basic	$	(0.27)	$	(0.16)		$	0.02	(2)	$	(0.02)
Diluted	$	(0.27)	$	(0.16)		$	0.02	(2)	$	(0.02)

	Fiscal 2014 Quarter Ended
	March 31,		June 30,			September 30,			December 31,
Total revenue	$	11,642	$	11,425		$	20,623	(1)	$	16,904
Total gross profit		2,676		3,126			13,162			4,438
Total operating expenses		20,921		21,428			21,575			22,332
Loss from operations		(18,245)		(18,302)			(8,413)			(17,894)
Net loss		(18,886)		(19,136)			(9,163)			(18,975)
Basic and diluted net loss per share	$	(0.28)	$	(0.27)		$	(0.13)		$	(0.26)

(1)

(2)

Summary Of Significant Accounting Policies (Narrative) (Details)	1 Months Ended	3 Months Ended									12 Months Ended
	Sep. 30, 2013 USD ($)	Dec. 31, 2015 USD ($) customer	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) customer $ / shares	Sep. 30, 2014 USD ($) $ / shares	Jun. 30, 2014 USD ($) $ / shares	Mar. 31, 2014 USD ($) $ / shares	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) customer $ / shares	Dec. 31, 2014 USD ($) customer	Dec. 31, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Basic and diluted net loss per share \| $ / shares						$ (0.26)	$ (0.13)	$ (0.27)	$ (0.28)
Fair value assets liabilities transfer between levels											$ 0
Future cash flows weighted average market yield		13.50%				19.50%					13.50%	19.50%
Highly liquid investments considered to be cash equivalents, maximum maturity											3 months
Impairment charges on investments											$ 0	$ 0	$ 0
Long-term restricted cash		$ 4,500,000									$ 4,500,000
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of individual customers \| customer		4				3					4	3
Accounts Receivable [Member] \| Domestic Customers [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage											64.00%	58.00%
Lab Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life											3 years
Building [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life											30 years
Minimum [Member] \| Accounts Receivable [Member] \| Customer A [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage											10.00%	10.00%
Minimum [Member] \| Accounts Receivable [Member] \| Customer B [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage											10.00%	10.00%
Minimum [Member] \| Accounts Receivable [Member] \| Customer C [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage											10.00%	10.00%
Minimum [Member] \| Accounts Receivable [Member] \| Customer D [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage											10.00%
Minimum [Member] \| Computer Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life											2 years
Minimum [Member] \| Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life											3 years
Minimum [Member] \| Furniture and Fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life											3 years
Maximum [Member] \| Computer Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life											3 years
Maximum [Member] \| Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life											5 years
Maximum [Member] \| Furniture and Fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life											7 years
Roche Agreement [Member]
Summary Of Significant Accounting Policies [Line Items]
Non-refundable upfront payment	$ 35,000,000
Amortization		$ 3,600,000	$ 3,600,000	$ 3,600,000	$ 3,600,000	$ 1,700,000	$ 1,700,000	$ 1,700,000	$ 1,700,000	$ 1,700,000
Additional contractual revenue being recognized in the period		$ 1,900,000	$ 1,900,000	$ 1,900,000	$ 1,900,000						$ 7,600,000
Basic and diluted net loss per share \| $ / shares											$ (0.10)

Summary Of Significant Accounting Policies (Summary Of Assets And Liabilities Measured At Fair Value Classified Based On Level Of Input) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Total assets measured at fair value	$ 86,770	$ 101,348
Liabilities
Total liabilities measured at fair value	600	944
Financing Derivative [Member]
Liabilities
Total liabilities measured at fair value	600	944
Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	33,629	36,449
Cash and cash equivalents [Member] \| Cash and money market funds [Member]
Assets
Total cash and cash equivalents	22,034	21,952
Cash and cash equivalents [Member] \| Commercial paper [Member]
Assets
Total cash and cash equivalents	8,595	14,497
Cash and cash equivalents [Member] \| U.S. government and agency securities [Member]
Assets
Total cash and cash equivalents	3,000
Investments [Member]
Assets
Total investments	48,641	64,899
Investments [Member] \| Commercial paper [Member]
Assets
Total investments	15,903	43,653
Investments [Member] \| Corporate debt securities [Member]
Assets
Total investments	1,265	8,173
Investments [Member] \| U.S. government and agency securities [Member]
Assets
Total investments	28,136
Investments [Member] \| Asset backed securities [Member]
Assets
Total investments	3,337	13,073
Long-term restricted cash [Member] \| Cash [Member]
Assets
Long-term restricted cash	4,500
Level 1 [Member]
Assets
Total assets measured at fair value	26,534	21,952
Level 1 [Member] \| Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	22,034	21,952
Level 1 [Member] \| Cash and cash equivalents [Member] \| Cash and money market funds [Member]
Assets
Total cash and cash equivalents	22,034	21,952
Level 1 [Member] \| Long-term restricted cash [Member] \| Cash [Member]
Assets
Long-term restricted cash	4,500
Level 2 [Member]
Assets
Total assets measured at fair value	60,236	79,396
Level 2 [Member] \| Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	11,595	14,497
Level 2 [Member] \| Cash and cash equivalents [Member] \| Commercial paper [Member]
Assets
Total cash and cash equivalents	8,595	14,497
Level 2 [Member] \| Cash and cash equivalents [Member] \| U.S. government and agency securities [Member]
Assets
Total cash and cash equivalents	3,000
Level 2 [Member] \| Investments [Member]
Assets
Total investments	48,641	64,899
Level 2 [Member] \| Investments [Member] \| Commercial paper [Member]
Assets
Total investments	15,903	43,653
Level 2 [Member] \| Investments [Member] \| Corporate debt securities [Member]
Assets
Total investments	1,265	8,173
Level 2 [Member] \| Investments [Member] \| U.S. government and agency securities [Member]
Assets
Total investments	28,136
Level 2 [Member] \| Investments [Member] \| Asset backed securities [Member]
Assets
Total investments	3,337	13,073
Level 3 [Member]
Liabilities
Total liabilities measured at fair value	600	944
Level 3 [Member] \| Financing Derivative [Member]
Liabilities
Total liabilities measured at fair value	$ 600	$ 944

Summary Of Significant Accounting Policies (Changes In Fair Value Of Financial Derivative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Summary Of Significant Accounting Policies [Abstract]
Balance as of December 31	$ 944	$ 549
(Gain) loss on change in fair value of Financing Derivative	(344)	395
Balance as of December 31	$ 600	$ 944

Summary Of Significant Accounting Policies (Estimated Fair Value And Carrying Value Of Notes) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Estimated Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term notes payable	$ 18,037	$ 14,817
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term notes payable	$ 14,948	$ 13,991

Summary Of Significant Accounting Policies (Impact Of Early Adoption On Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
New Accounting Pronouncement, Early Adoption [Line Items]
Other long-term assets	$ 7,518	$ 29
Total assets	131,107	124,390
Notes payable	14,948	13,991
Total liabilities	57,567	69,441
Early Adoption of ASU 2015-03 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Other long-term assets	7,518	29
Total assets	7,518	29
Notes payable	14,948	13,991
Total liabilities	14,948	13,991
Early Adoption of ASU 2015-03 [Member] \| Prior to Adoption [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Other long-term assets	7,631	162
Total assets	7,631	162
Notes payable	15,061	14,124
Total liabilities	15,061	14,124
Early Adoption of ASU 2015-03 [Member] \| Adjustment [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Other long-term assets	(113)	(133)
Total assets	(113)	(133)
Notes payable	(113)	(133)
Total liabilities	$ (113)	$ (133)

Contractual Revenue (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended									12 Months Ended
	Sep. 30, 2013	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Income (loss) per basic share		$ (0.02)	$ 0.02	$ (0.16)	$ (0.27)
Income (loss) per diluted share		$ (0.02)
Basic and diluted net loss per share						$ (0.26)	$ (0.13)	$ (0.27)	$ (0.28)
Roche Agreement [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Non-refundable upfront payment	$ 35.0
Amortization		$ 3.6	$ 3.6	$ 3.6	$ 3.6	$ 1.7	$ 1.7	$ 1.7	$ 1.7	$ 1.7
Additional contractual revenue being recognized in the period		1.9	$ 1.9	1.9	$ 1.9						$ 7.6
Margin											100.00%
Net loss											$ (7.6)
Basic and diluted net loss per share											$ (0.10)
Deferred revenue		12.1									$ 12.1
Maximum potential for additional payments to be recognized upon the achievement of certain development milestones		40.0									$ 40.0
Deferred revenue, revenue recognized		$ 20.0		$ 10.0			$ 10.0

Cash And Cash Equivalents And Investments (Summary Of Cash, Cash Equivalents And Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 82,277	$ 101,339
Gross unrealized gains	6	17
Gross unrealized losses	(13)	(8)
Fair Value	82,270	101,348
Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,629	36,448
Gross unrealized gains		1
Fair Value	33,629	36,449
Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	48,648	64,891
Gross unrealized gains	6	16
Gross unrealized losses	(13)	(8)
Fair Value	48,641	64,899
Long-term restricted cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,500
Fair Value	4,500
Cash and money market funds [Member] \| Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,034	21,952
Fair Value	22,034	21,952
Commercial paper [Member] \| Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,595	14,496
Gross unrealized gains		1
Fair Value	8,595	14,497
Commercial paper [Member] \| Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,903	43,648
Gross unrealized gains	2	5
Gross unrealized losses	(2)
Fair Value	15,903	43,653
Corporate debt securities [Member] \| Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,266	8,170
Gross unrealized gains		7
Gross unrealized losses	(1)	(4)
Fair Value	1,265	8,173
Asset backed securities [Member] \| Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,337	13,073
Gross unrealized gains		4
Gross unrealized losses		(4)
Fair Value	3,337	$ 13,073
U.S. government and agency securities [Member] \| Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,000
Fair Value	3,000
U.S. government and agency securities [Member] \| Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	28,142
Gross unrealized gains	4
Gross unrealized losses	(10)
Fair Value	28,136
Cash [Member] \| Long-term restricted cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,500
Fair Value	$ 4,500

Cash And Cash Equivalents And Investments (Summary Of Contractual Maturities Of Cash Equivalents And Available-For-Sale Investments) (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Cash And Cash Equivalents And Investments [Abstract]
Due in one year or less	$ 60,236

Balance Sheet Components (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Balance Sheet Components [Line Items]
Receivable from existing landlord	$ 10,000
Prepaid expenses and other current assets	12,071	$ 1,671
Other long-term assets	7,518	29
Depreciation expense	3,677	$ 4,221	$ 5,648
Lease Amendment Agreement [Member]
Balance Sheet Components [Line Items]
Lease incentive receivable, noncurrent	15,000
Prepaid expenses and other current assets	10,000
Other long-term assets	$ 5,000

Balance Sheet Components (Components Of Inventory) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Balance Sheet Components [Abstract]
Purchased materials	$ 4,041	$ 3,150
Work in process	3,576	6,115
Finished goods	3,338	2,070
Inventory	$ 10,955	$ 11,335

Balance Sheet Components (Components Of Prepaid Expenses And Other Current Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Balance Sheet Components [Abstract]
Receivable from existing landlord	$ 10,000
Prepaid expenses	1,330	$ 1,564
Other current assets	741	107
Prepaid expenses and other current assets	$ 12,071	$ 1,671

Balance Sheet Components (Components Of Property and Equipment, Net) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment	$ 42,413	$ 37,058
Less: Accumulated depreciation	(33,865)	(30,457)
Property and equipment, net	8,548	6,601
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	1,160	1,160
Laboratory Equipment And Machinery [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	20,358	17,169
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	8,348	8,348
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	6,781	4,885
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	4,798	4,485
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 968	958
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment		$ 53

Balance Sheet Components (Schedule Of Accrued Expenses) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Balance Sheet Components [Abstract]
Salaries and benefits	$ 8,129	$ 6,325
Accrued license and development services	5,459	3,741
Inventory accrual, professional services, accrued interest and other	1,963	1,375
Accrued expenses	$ 15,551	$ 11,441

Notes Payable (Narrative) (Details) - USD ($)	1 Months Ended	12 Months Ended
Notes Payable (Narrative) (Details) - USD ($)	Feb. 28, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 05, 2013
Debt Instrument [Line Items]
Number of shares of common stock called by issuance of warrants	5,500,000				5,500,000
Aggregate exercise price of common stock called by issuance of warrants	$ 2.63				$ 2.63
Cash and cash equivalent minimum amount quarterly required	$ 2,000,000
Future cash flows weighted average market yield		13.50%	19.50%
Fair value of the financing derivative		$ 600,000	$ 944,000	$ 549,000
Fair value of the warrants	6,400,000
Notes [Member]
Debt Instrument [Line Items]
Principal amount of notes	14,100,000
Carrying value of the notes	12,800,000
Original issue discount	$ 7,700,000
Debt discount that has yet to be amortized		$ 5,400,000	$ 6,400,000
Maturity date	Feb. 29, 2020
Deerfield promissory notes [Member]
Debt Instrument [Line Items]
Principal amount of notes	$ 20,500,000
Debt instrument, stated interest rate	8.75%
Percentage of net proceeds from out side financing or equity component		25.00%
Facility agreement exercisable limit		15,000,000
Percentage of principal amount repaid		100.00%
Proceeds from issuance of debt	$ 20,500,000
Maximum [Member] \| Deerfield promissory notes [Member]
Debt Instrument [Line Items]
Facility agreement period		7 years

Notes Payable (Schedule Of Debt Payments) (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
2016	$ 1,799
2017	1,794
2018	5,632
2019	2,817
2020	15,142
Total remaining payments	27,184
Less: interest and discounts	(12,236)
Prior to Adoption [Member] \| Early Adoption of ASU 2015-03 [Member]
Debt Instrument [Line Items]
Total debt payments	$ 14,948

Commitments And Contingencies (Narrative) (Details)			1 Months Ended		12 Months Ended
Commitments And Contingencies (Narrative) (Details)	Jul. 23, 2015 USD ($) item	Jul. 22, 2015 USD ($)	Feb. 29, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2009 USD ($)
Commitments and Contingencies [Line Items]
Future minimum rent payments					$ 389,000
Other liabilities, non-current					1,386,000	$ 2,153,000
Gain on lease amendments					23,043,000
Prepaid expenses and other current assets					12,071,000	1,671,000
Other long-term assets					7,518,000	29,000
Long-term restricted cash					4,500,000
Rent expense					1,100,000	$ 2,200,000	$ 2,300,000
Other commitments estimated amount					14,400,000
Additional liability associated with indemnification obligations					0
Menlo Park [Member]
Commitments and Contingencies [Line Items]
Tenant improvement allowance								$ 1,800,000
Building and leasehold improvement assets								3,000,000
Fair value of the facility prior to commencing renovations								1,200,000
Landlord incentives within property and equipment, net								$ 1,800,000
Future minimum rent payments					0
Other liabilities, non-current					1,400,000
Lease Amendment Agreement [Member]
Commitments and Contingencies [Line Items]
Number of eligible payments from existing landlord \| item	4
Eligible payments from existing landlord	$ 5,000,000
Aggregate Landlord payments receivable					20,000,000
Proceeds from lease incentive receivable				$ 5,000,000
Prepaid expenses and other current assets					10,000,000
Other long-term assets					5,000,000
Lease incentive receivable, noncurrent					$ 15,000,000
Lease Amendment Agreement [Member] \| Subsequent Event [Member]
Commitments and Contingencies [Line Items]
Proceeds from lease incentive receivable			$ 5,000,000
O’Brien Lease Agreement [Member]
Commitments and Contingencies [Line Items]
Lease term		132 months
Rent expense first twelve months		$ 540,000
Rent expense last twelve months		711,000
Expected prepaid rent		2,160,000
Expected prepaid operating costs		180,000
Expected security deposit		4,500,000
Expected improvement allowance		12,600,000
Expected rent payments		80,000,000
Expected operating costs		$ 24,000,000

Commitments And Contingencies (Schedule Of Minimum Future Lease Payments Remaining) (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Commitments And Contingencies [Abstract]
2016	$ 131
2017	146
2018	112
Total minimum lease payments	$ 389

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Increase in valuation allowance	$ 285,600	$ 273,600
Benefit of federal net operating loss deferred tax assets	4,900
Benefit of state net operating loss deferred tax assets	600
Total unrecognized tax benefit	$ 18,735	16,952	$ 11,634	$ 9,992
Period of increase or decrease in total amount of unrecognized income tax benefits	12 months
Accrued interest or penalties	$ 0	$ 0
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 612,900
Net operating loss carryforward, expiration	2024
Research and development credit carryforward	$ 23,900
Research and developmen tax credit carryforward, expiration	2024
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 523,400
Net operating loss carryforward, expiration	2015
Research and development credit carryforward	$ 25,600

Income Taxes (Reconciliation Of Federal Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Statutory tax rate	35.00%	35.00%	35.00%
State tax rate, net of federal benefit	(3.50%)	3.80%	2.10%
Stock-based compensation	(4.00%)	(1.30%)	(1.70%)
R&D credit	11.00%	4.00%	4.30%
Other	(0.60%)	0.00%	(0.30%)
Change in valuation allowance	(37.90%)	(41.50%)	(39.40%)
Effective income tax rate	0.00%	0.00%	0.00%

Income Taxes (Reconciliation Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Net operating loss carryforwards	$ 235,659	$ 225,115
Research and development credits	28,346	24,881
Depreciation	1,403	3,241
Accruals and reserves	20,385	21,737
Total deferred tax assets	285,793	274,974
Less: Valuation allowance	(285,556)	(273,567)
Deferred tax liabilities:
Deferred rent	(237)	(1,407)
Net deferred tax assets

Income Taxes (Reconciliation Of Unrecognized Tax Benefit Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Unrecognized tax benefit, Beginning balance	$ 16,952	$ 11,634	$ 9,992
Increase in balance related to tax positions taken in prior year		2,959
Decrease in balance related to tax positions taken in prior year	(44)
Increase in balance related to tax positions taken during current year	1,827	2,359	1,642
Unrecognized tax benefit, Ending balance	$ 18,735	$ 16,952	$ 11,634

Stockholders' Equity (Narrative) (Details)	1 Months Ended	2 Months Ended	12 Months Ended
Stockholders' Equity (Narrative) (Details)	Jan. 31, 2016 shares	Mar. 07, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) item $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Feb. 03, 2016 USD ($)	Feb. 03, 2015 USD ($)	Nov. 08, 2013 USD ($)	Feb. 28, 2013 $ / shares shares	Feb. 05, 2013 $ / shares shares	Oct. 05, 2012 USD ($)	Oct. 31, 2010 $ / shares shares
Stockholders' Equity [Line Items]
Common Stock, shares authorized \| shares			1,000,000,000	1,000,000,000								1,000,000,000
Common Stock, par value \| $ / shares			$ 0.001	$ 0.001								$ 0.001
Preferred Stock, shares authorized \| shares			50,000,000	50,000,000								50,000,000
Preferred Stock, par value \| $ / shares			$ 0.001	$ 0.001								$ 0.001
Preferred Stock, shares issued \| shares			0	0
Preferred Stock, shares outstanding \| shares			0	0
Common stock, dividends declared \| $ / shares			$ 0
Voting right of common stock share holders			The holder of each share of common stock is entitled to one vote.
Voting right of common stock share holdes, number of votes \| item			1
Proceeds from issuance of common stock \| $			$ 7,363,000	$ 3,968,000	$ 3,079,000
Number of shares of common stock called by issuance of warrants \| shares									5,500,000	5,500,000
Aggregate exercise price of common stock called by issuance of warrants \| $ / shares									$ 2.63	$ 2.63
Number of equity compensation plans \| item			3
Aggregate intrinsic value outstanding \| $			$ 145,400,000
Aggregate intrinsic value exercisable options \| $			$ 87,800,000
Stock price \| $ / shares			$ 13.13
Weighted average remaining contractual life for exercisable			5 years 11 months 12 days
Total intrinsic value of options exercised \| $			$ 3,500,000	2,000,000	500,000
Fair value of options vested \| $			7,300,000	6,000,000	6,500,000
Stock-based compensation cost capitalized in inventory \| $			315,000	225,000
Stock-based compensation \| $			$ 13,840,000	$ 9,943,000	$ 9,905,000
2010 Plan [Member]
Stockholders' Equity [Line Items]
Stock option grant, term			10 years
Stock option grant, vest			4 years
Stock option grant, vest rate upon first anniversary			25.00%
Stock option grant, vest rate per month thereafter			2.08%
2010 Director Plan [Member]
Stockholders' Equity [Line Items]
Stock option grant, term			10 years
Stock option grant, vest rate upon first anniversary			33.00%
Stock option grant, vest rate per month thereafter			2.78%
2010 Director Plan [Member] \| Minimum [Member]
Stockholders' Equity [Line Items]
Stock option grant, vest			1 year
2010 Director Plan [Member] \| Maximum [Member]
Stockholders' Equity [Line Items]
Stock option grant, vest			3 years
2010 Plan and 2010 Director Plan [Member]
Stockholders' Equity [Line Items]
Common stock reserved for issuance \| shares			5,500,000
ESPP [Member]
Stockholders' Equity [Line Items]
Common stock reserved for issuance \| shares			397,633
Percentage of outstanding common stock used to determine annual plan increase			2.00%
Number of purchase periods \| item			4
Purchase period of ESPP			6 months
Percentage of fair market value at which stock can be purchased			85.00%
Weighted average fair value at grant date \| $ / shares			$ 2.20	$ 2.98	$ 1.76
Stock-based compensation \| $			$ 3,600,000	$ 2,100,000	$ 2,800,000
Common stock purchased under plan \| shares			1,100,000	1,300,000	1,500,000
Cash received from option exercises \| $			$ 4,400,000	$ 2,300,000	$ 2,600,000
At the Market Offering [Member]
Stockholders' Equity [Line Items]
Common stock offering price shares \| $							$ 30,000,000	$ 30,000,000			$ 30,000,000
Commissions			3.00%
Shares issued \| shares			4,100,000
Average common stock price per share \| $ / shares			$ 7.36
Stock Options [Member]
Stockholders' Equity [Line Items]
Weighted average remaining contractual life			3 years
Weighted average fair value at grant date \| $ / shares			$ 4.75	$ 3.81	$ 1.80
Stock-based compensation \| $			$ 10,200,000	$ 7,800,000	$ 7,000,000
Unrecognized compensation costs \| $			20,700,000
Cash received from option exercises \| $			$ 3,000,000	$ 1,600,000	$ 500,000
Subsequent Event [Member]
Stockholders' Equity [Line Items]
Number of shares of common stock called by issuance of warrants \| shares		3,818,000
Aggregate exercise price of common stock called by issuance of warrants \| $ / shares		$ 2.63
Number of shares of common stock called by issuance of warrants, outstanding \| shares		1,682,000
Subsequent Event [Member] \| 2010 Plan [Member]
Stockholders' Equity [Line Items]
Additional common stock reserved for issuance \| shares	4,000,000
Subsequent Event [Member] \| 2010 Director Plan [Member]
Stockholders' Equity [Line Items]
Common stock reserved for issuance \| shares	800,000
Subsequent Event [Member] \| ESPP [Member]
Stockholders' Equity [Line Items]
Additional common stock reserved for issuance \| shares	1,600,000
Subsequent Event [Member] \| At the Market Offering [Member]
Stockholders' Equity [Line Items]
Common stock offering price shares \| $						$ 30,000,000
Shares issued \| shares		2,700,000
Average common stock price per share \| $ / shares		$ 8.79
Proceeds from issuance of common stock \| $		$ 23,400,000
Notes [Member]
Stockholders' Equity [Line Items]
Holders may elect to receive net proceeds from financing activities, percentage		25.00%

Stockholders' Equity (Summary Of Stock Option Activity) (Details) - Stock Options [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Additional shares reserved, Shares available for grant	4,799
$0.70 – 16.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Balances, December 31, 2014, Shares available for grant	4,874
Balances, December 31, 2015, Shares available for grant	5,814	4,874
Balances, December 31, 2014, Number of shares	16,491
Balances, December 31, 2015, Number of shares	19,468	16,491
Exercise price, lower range	$ 0.70	$ 0.70
Exercise price, upper range	16.00	16.00
Balances, December 31, 2014, Weighted average exercise price per share	5.10
Balances, December 31, 2015, Weighted average exercise price per share	$ 5.69	$ 5.10
$4.55 – 10.07 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted, Shares available for grant	(4,500)
Options granted, Number of shares	4,500
Exercise price, lower range	$ 4.55
Exercise price, upper range	10.07
Options granted, Weighted average exercise price per share	$ 7.51
$0.70 – 10.84 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options exercised, Number of shares	(882)
Exercise price, lower range	$ 0.70
Exercise price, upper range	10.84
Options exercised, Weighted average exercise price per share	$ 3.27
$1.16 – 15.98 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options canceled, Shares available for grant	641
Options canceled, Number of shares	(641)
Exercise price, lower range	$ 1.16
Exercise price, upper range	15.98
Options canceled, Weighted average exercise price per share	$ 6.60

Stockholders' Equity (Reconciliation Of Outstanding And Exercisable Stock Options) (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number outstanding \| shares	19,467,724
Weighted average remaining contractual life	7 years 4 days
Weighted average exercise price	$ 5.69
Number vested \| shares	11,389,743
Weighted average exercise price	$ 5.47
$0.00 - 1.60 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise price, lower range	0.00
Exercise price, upper range	$ 1.60
Number outstanding \| shares	827,488
Weighted average remaining contractual life	6 years 9 months
Weighted average exercise price	$ 1.17
Number vested \| shares	502,194
Weighted average exercise price	$ 1.17
$1.60 - 3.20 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise price, lower range	1.60
Exercise price, upper range	$ 3.20
Number outstanding \| shares	3,802,953
Weighted average remaining contractual life	6 years 15 days
Weighted average exercise price	$ 2.42
Number vested \| shares	2,978,692
Weighted average exercise price	$ 2.47
$3.20 - 4.80 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise price, lower range	3.20
Exercise price, upper range	$ 4.80
Number outstanding \| shares	4,226,360
Weighted average remaining contractual life	6 years 7 months 28 days
Weighted average exercise price	$ 4.10
Number vested \| shares	2,947,959
Weighted average exercise price	$ 4.07
$4.80 - 6.40 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise price, lower range	4.80
Exercise price, upper range	$ 6.40
Number outstanding \| shares	3,486,254
Weighted average remaining contractual life	8 years 2 months 23 days
Weighted average exercise price	$ 5.65
Number vested \| shares	1,288,411
Weighted average exercise price	$ 5.68
$6.40 - 8.00 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise price, lower range	6.40
Exercise price, upper range	$ 8.00
Number outstanding \| shares	3,264,464
Weighted average remaining contractual life	7 years 11 months 19 days
Weighted average exercise price	$ 6.98
Number vested \| shares	1,229,713
Weighted average exercise price	$ 6.97
$8.00 - 9.60 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise price, lower range	8.00
Exercise price, upper range	$ 9.60
Number outstanding \| shares	1,088,077
Weighted average remaining contractual life	4 years 1 month 6 days
Weighted average exercise price	$ 8.50
Number vested \| shares	1,088,077
Weighted average exercise price	$ 8.50
$9.60 - 11.20 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise price, lower range	9.60
Exercise price, upper range	$ 11.20
Number outstanding \| shares	1,627,201
Weighted average remaining contractual life	9 years 1 month 24 days
Weighted average exercise price	$ 10.18
Number vested \| shares	246,501
Weighted average exercise price	$ 10.79
$11.20 - 12.80 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise price, lower range	11.20
Exercise price, upper range	$ 12.80
Number outstanding \| shares	621,077
Weighted average remaining contractual life	5 years 29 days
Weighted average exercise price	$ 12.10
Number vested \| shares	592,344
Weighted average exercise price	$ 12.12
$12.80 - 14.40 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise price, lower range	12.80
Exercise price, upper range	$ 14.40
Number outstanding \| shares	386,100
Weighted average remaining contractual life	5 years
Weighted average exercise price	$ 13.87
Number vested \| shares	378,102
Weighted average exercise price	$ 13.87
$14.40 - 16.00 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise price, lower range	14.40
Exercise price, upper range	$ 16.00
Number outstanding \| shares	137,750
Weighted average remaining contractual life	4 years 10 months 10 days
Weighted average exercise price	$ 15.99
Number vested \| shares	137,750
Weighted average exercise price	$ 15.99

Stockholders' Equity (Schedule Of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 13,840	$ 9,943	$ 9,905
Cost of revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	1,313	758	523
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	5,196	3,785	4,052
Sales, general and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 7,331	$ 5,400	$ 5,330

Stockholders' Equity (Schedule Of Fair Value Of Employee Stock Options And Employee Stock Purchase Plan) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility	70.00%	70.00%	70.00%
Risk-free interest rate, minimum	0.10%	0.10%	0.10%
Risk-free interest rate, maximum	0.70%	0.50%	0.40%
Dividend yield
ESPP [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term	6 months	6 months	6 months
ESPP [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term	2 years	2 years	2 years
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days
Expected volatility	70.00%	70.00%	66.80%
Risk-free interest rate	1.70%	1.90%	1.30%
Dividend yield

Net Loss Per Share (Computation Of Basic And Diluted Net Loss Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator
Net loss	$ (1,409)	$ 1,821	$ (11,935)	$ (20,173)	$ (18,975)	$ (9,163)	$ (19,136)	$ (18,886)	$ (31,696)	$ (66,160)	$ (79,293)
Denominator:
Weighted average shares used in computation of basic and diluted net loss per share									75,614	70,475	62,784
Basic and diluted net loss per share									$ (0.42)	$ (0.94)	$ (1.26)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Loss Per Share (Anti-Dilutive Shares Excluded From Computation Of Diluted Net Loss Per Share) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Stock excluded from the computation of diluted net loss per share	19,468	16,491	14,070
Warrants to purchase common stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Stock excluded from the computation of diluted net loss per share	5,500	5,500	5,500

Segment And Geographic Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
Segment And Geographic Information (Details) $ in Thousands	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments \| segment									1
Revenue	$ 36,281	$ 13,917	$ 24,939	$ 17,645	$ 16,904	$ 20,623	$ 11,425	$ 11,642	$ 92,782	$ 60,594	$ 28,181
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									68,800	34,800	13,600
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									9,000	10,100	9,200
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 15,000	$ 15,700	$ 5,400

Unaudited Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information [Line Items]
Total revenue	$ 36,281	$ 13,917	$ 24,939	$ 17,645	$ 16,904	$ 20,623	$ 11,425	$ 11,642	$ 92,782	$ 60,594	$ 28,181
Total gross profit	26,466	6,551	14,506	5,927	4,438	13,162	3,126	2,676	53,450	23,402	6,419
Total operating expenses	27,528	3,937	25,864	25,255	22,332	21,575	21,428	20,921	82,584	86,256	83,962
Income (loss) from operations	(1,062)	2,614	(11,358)	(19,328)	(17,894)	(8,413)	(18,302)	(18,245)	(29,134)	(62,854)	(77,543)
Net income (loss)	$ (1,409)	$ 1,821	$ (11,935)	$ (20,173)	$ (18,975)	$ (9,163)	$ (19,136)	$ (18,886)	(31,696)	$ (66,160)	$ (79,293)
Net income (loss) per share, basic	$ (0.02)	$ 0.02	$ (0.16)	$ (0.27)
Net income (loss) per share, diluted	$ (0.02)
Basic and diluted net loss per share					$ (0.26)	$ (0.13)	$ (0.27)	$ (0.28)
Gain on lease amendments									$ 23,043
Roche Agreement [Member]
Quarterly Financial Information [Line Items]
Basic and diluted net loss per share									$ (0.10)
Deferred revenue, revenue recognized	$ 20,000		$ 10,000			$ 10,000