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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
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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 |  |

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