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Income Taxes - Components of Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 21,501 | $ 9,513
Depreciation and amortization | 419 | 480
Accruals/other | 908 | 293
Research and development credits & foreign credits | 1,143 | 285
Total deferred tax assets | 23,971 | 10,571
Valuation allowance | (23,971) | (10,571)
Net deferred tax assets | $ 0 | $ 0

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