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Income Taxes - Significant Components of the Company's Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred Tax Assets, Net [Abstract]    
Net operating loss carryforwards $ 68,639 $ 30,572
Research credits 2,643 1,919
Stock awards 2,583 1,011
Other 1,558 571
Gross deferred tax assets 75,423 34,073
Valuation allowance (74,520) (33,845)
Total deferred tax assets 903 228
Deferred tax liabilities (903) (228)
Net deferred tax assets $ 0 $ 0