Unaudited Selected Quarterly Financial Data (Schedule Of Unaudited Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unaudited Selected Quarterly Financial Data [Abstract]
Total revenue	$ 27,930	$ 21,915	$ 24,621	$ 16,425	$ 19,526	$ 18,160	$ 21,578	$ 19,362	$ 90,891	$ 78,626	$ 93,468
Total gross profit	12,932	6,914	9,613	5,117	5,746	3,192	8,862	7,296	34,576	25,096	34,659
Total operating expenses	30,849	35,028	33,993	35,251	36,369	27,862	30,607	31,245	135,121	126,083	124,443
Loss from operations	(17,917)	(28,114)	(24,380)	(30,134)	(30,623)	(24,670)	(21,745)	(23,949)	(100,545)	(100,987)	(89,784)
Gain from Continuation Advances	18,000								18,000
Net loss	$ (91)	$ (29,123)	$ (24,596)	$ (30,324)	$ (30,799)	$ (25,044)	$ (22,540)	$ (24,179)	$ (84,134)	$ (102,562)	$ (92,189)
Basic and diluted net loss per share	$ 0.00	$ (0.19)	$ (0.16)	$ (0.20)	$ (0.21)	$ (0.19)	$ (0.17)	$ (0.20)
Weighted average shares used in computing net loss per share	153,051	152,983	152,776	151,274	149,314	135,130	131,882	123,768	152,527,000	135,094,000	105,682,000
Continuation Advances from Illumina	$ 18,000								$ 18,000

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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