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Debt - Scheduled Future Payments on Term Loan (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term portion $ 55,489 $ 55,364
SVB Term Loan    
Debt Instrument [Line Items]    
The remainder of 2019 0  
2020 1,555  
2021 18,667  
2022 18,667  
2023 17,111  
Total future principal payments 56,000  
Less: unamortized debt discount (511)  
Carrying value of long-term debt 55,489  
Less: current portion 0  
Long-term portion $ 55,489