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Income Taxes Effect of Each Type of Temporary Difference Comprising Net Differed Tax Asset (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating losses | $ 119,355 | $ 110,715 |
Stock-based compensation | 8,113 | 12,446 |
Tax credits | 7,816 | 6,378 |
Other reserves and accrued liabilities | 6,344 | 3,587 |
Gross deferred tax assets | 141,628 | 133,126 |
Less: valuation allowance | (140,117) | (131,389) | $ (109,274)
Total deferred tax assets | 1,511 | 1,737 |
Deferred tax liabilities: |  |  |
Depreciation and amortization | (1,011) | (1,145) |
Other liabilities | (500) | (592) |
Total deferred tax liabilities | $ (1,511) | $ (1,737) |

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