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v3.20.4

Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Reserves and accruals | $ 21,823 | $ 20,622 |  |
Net operating loss carryforwards | 39,733 | 33,811 |  |
Research and development credit carryforwards | 38,179 | 36,914 |  |
Deferred stock-based compensation | 1,202 | 1,675 |  |
Intangibles | 7,838 | 8,224 |  |
Operating lease liabilities | 7,822 | 8,892 |  |
Capitalized research and development expenses | 10,805 | 10,897 |  |
Other | 442 | 0 |  |
Gross deferred tax assets | 127,844 | 121,035 |  |
Valuation allowance | (99,585) | (95,518) | $ (77,144) | $ (77,756)
Gross deferred tax assets after valuation allowance | 28,259 | 25,517 |  |
Deferred tax liabilities: |  |  |  |
Depreciation | (6,399) | (1,272) |  |
Convertible notes | (4,708) | (6,275) |  |
Operating lease right-of-use assets | (6,529) | (7,076) |  |
Other | 0 | (319) |  |
Gross deferred tax liabilities | (17,636) | (14,942) |  |
Net deferred tax assets | $ 10,623 | $ 10,575 |  |

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