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Debt - Scheduled Future Payments on Term Loan (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Less: current portion $ (1,556) $ 0
Long-term portion 53,995 $ 55,364
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 (449)  
Carrying value of long-term debt 55,551  
Less: current portion (1,556)  
Long-term portion $ 53,995