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Income Taxes - Schedule of Temporary Differences Between Basis 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 $ 33,275 $ 21,248  
Tax credit carryforwards 4,365 3,038  
Accrued expenses 103 32  
Property and equipment   390  
Deferred rent 2,209 53  
Equity compensation 784 503  
Amortizable intangibles 1,339 1,492  
Other 78    
Gross deferred tax assets 42,153 26,756  
Deferred tax liability:      
Other   (241)  
Property and equipment (1,863)    
Valuation allowance $ (40,290) $ (26,515) $ (13,060)