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Income Taxes - Income Taxes Effect of Each Type of Temporary Difference Comprising Net Differed Tax Asset (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating losses | $ 118,220 | $ 119,355 |
Stock-based compensation | 7,111 | 8,113 |
Tax credits | 9,149 | 7,816 |
Lease Liability | 2,715 |  |
Other reserves and accrued liabilities | 5,580 | 6,344 |
Gross deferred tax assets | 142,775 | 141,628 |
Less: valuation allowance | (137,976) | (140,117) | $ (131,389)
Total deferred tax assets | 4,799 | 1,511 |
Deferred tax liabilities: |  |  |
Depreciation and amortization | (2,544) | (1,011) |
Lease Asset | (2,242) |  |
Other liabilities | (13) | (500) |
Total deferred tax liabilities | $ (4,799) | $ (1,511) |

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