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Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 71,925 | $ 65,957
Tax credit carryforwards | 4,947 | 4,533
Accruals | 1,274 | 1,125
Other | 1,088 | 698
Gross deferred tax assets | 79,234 | 72,313
Valuation allowance | (76,295) | (70,053)
Total deferred tax assets | 2,939 | 2,260
Deferred tax liabilities: |  |
Property and equipment | 195 | 95
Purchased intangibles | (8,979) | (2,355)
Other | (212) | 0
Total deferred tax liabilities | (8,996) | $ (2,260)
Net deferred tax liabilities | $ (6,057) |

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