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Debt - Scheduled Future Payments on Term Loan (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term portion $ 55,364 $ 44,504
SVB Term Loan    
Debt Instrument [Line Items]    
2020 1,555  
2021 18,667  
2022 18,667  
2023 17,111  
Total future principal payments 56,000  
Less: unamortized debt discount (636)  
Carrying value of long-term debt 55,364  
Less: current portion 0  
Long-term portion $ 55,364