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The Company and Summary of Significant Accounting Policies - Summary of Impact of Adoption of Accounting Standards on Consolidated Statements Of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	$ 10,086	$ 16,600	$ 8,842
Cost of net revenue	3,931	6,346	4,694
Operating expenses	8,618	21,080	14,181
Interest expense	220	582	927
Other income, net	103	12	59
Income tax provision	0	13	(233)
Net loss	$ (2,580)	$ (11,409)	$ (10,668)
Net loss per share:
Basic and diluted	$ (1.19)	$ (14.82)	$ (29.07)
Balances without Adoption of ASC 606 | ASC 606
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Net loss		$ 10
Adjustments Due to ASC 606 | ASC 606
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Cost of net revenue		6,346
Operating expenses		21,080
Interest expense		582
Other income, net		12
Income tax provision		13
Net loss		$ (11,399)
Net loss per share:
Basic and diluted		$ (14.80)
Product [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	$ 9,377	$ 15,053	$ 7,833
Product [Member] | Adjustments Due to ASC 606 | ASC 606
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue		15,053
Royalty and Other [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	$ 709	1,547	$ 1,009
Royalty and Other [Member] | Balances without Adoption of ASC 606 | ASC 606
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue		10
Royalty and Other [Member] | Adjustments Due to ASC 606 | ASC 606
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue		$ 1,557

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