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Income Taxes Effect of Each Type of Temporary Difference Comprising Net Differed Tax Asset (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating losses | $ 88,996 | $ 80,096 |
Stock based compensation | 17,975 | 15,600 |
Depreciation | 74 | (90) |
Tax credits | 3,076 | 2,141 |
Other reserves and accrued liabilities | 2,796 | 1,708 |
Gross deferred tax assets | 112,917 | 99,455 |
Less: valuation allowance | (94,684) | (85,965) | $ (88,999)
Total deferred tax assets | $ 18,233 | $ 13,490 |

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