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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Total net revenue $ 16,600 $ 8,842 $ 6,024
Cost of net revenue 6,346 4,694 3,075
Operating expenses 21,080 14,181 34,313
Interest expense (582) (927) (687)
Other income, net 12 59 48
Income tax provision 13 (233) 45
Net loss $ (11,409) $ (10,668) $ (32,048)
Net loss per share:      
Basic and diluted $ (0.74) $ (1.45) $ (4.86)
Balances without Adoption of ASC 606 | ASU 2014-09      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Net loss $ 10    
Adjustments Due to ASC 606 | ASU 2014-09      
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 $ (0.74)    
Product [Member]      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Total net revenue $ 15,053 $ 7,833 $ 4,604
Product [Member] | Adjustments Due to ASC 606 | ASU 2014-09      
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 1,547 $ 1,009 $ 1,420
Royalty and Other [Member] | Balances without Adoption of ASC 606 | ASU 2014-09      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Total net revenue 10    
Royalty and Other [Member] | Adjustments Due to ASC 606 | ASU 2014-09      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Total net revenue $ 1,557