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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, 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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