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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:      
Net operating loss carryforwards $ 58,661 $ 28,913  
Federal and state tax credits 13,783 4,522  
Accrued expenses 4,276 1,903  
Share-based compensation 3,811 1,921  
Accumulated amortization 18,829    
Other 1,267 176  
Total deferred tax assets 100,627 37,435  
Valuation allowance (99,438) (36,069) $ (15,999)
Net deferred tax assets 1,189 1,366  
Deferred tax liabilities:      
Accumulated depreciation (1,155) (1,366)  
Other (34)    
Total deferred tax liabilities $ (1,189) $ (1,366)