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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