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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Reserves and accruals | $ 25,527 | $ 16,413 |  |
Net operating loss carryovers | 33,321 | 27,023 |  |
Research and development credit carryovers | 28,759 | 27,595 |  |
Deferred stock-based compensation | 4,292 | 5,834 |  |
Depreciation and amortization | 554 |  |  |
Other tax credits | 2,738 | 2,738 |  |
Gross deferred tax assets | 95,191 | 79,603 |  |
Valuation allowance | (74,480) | (64,545) | $ (75,199) | $ (38,644)
Gross deferred tax assets after valuation allowance | 20,711 | 15,058 |  |
Deferred tax liabilities: |  |  |  |
Depreciation and amortization | 0 | (1,189) |  |
Intangibles | (1,417) | (899) |  |
Convertible notes | (8,603) | (10,233) |  |
Other | (510) | (510) |  |
Gross deferred tax liabilities | (10,530) | (12,831) |  |
Net deferred tax assets | $ 10,181 | $ 2,227 |  |

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