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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Reserves and accruals | $ 20,622 | $ 17,090 |  |
Net operating loss carryforwards | 33,811 | 29,900 |  |
Research and development credit carryforwards | 36,914 | 36,446 |  |
Deferred stock-based compensation | 1,675 | 2,201 |  |
Intangibles | 8,224 | 2,585 |  |
Operating lease liabilities | 5,877 |  |  |
Capitalized research and development expenses | 10,897 |  |  |
Other | 0 | 939 |  |
Gross deferred tax assets | 118,020 | 89,161 |  |
Valuation allowance | (95,518) | (77,144) | $ (77,756) | $ (74,480)
Gross deferred tax assets after valuation allowance | 22,502 | 12,017 |  |
Deferred tax liabilities: |  |  |  |
Depreciation | (1,272) | (391) |  |
Convertible notes | (6,275) | (2,931) |  |
Operating lease right-of-use assets | (4,061) |  |  |
Other | (319) |  |  |
Gross deferred tax liabilities | (11,927) | (3,322) |  |
Net deferred tax assets | $ 10,575 | $ 8,695 |  |

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