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Debt - Scheduled Future Payments on Term Loan (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Less: current portion $ (10,889) $ (1,556)
Long-term portion 44,756 $ 53,995
SVB Term Loan    
Debt Instrument [Line Items]    
The remainder of 2020 1,555  
2021 18,667  
2022 18,667  
2023 17,111  
2024 0  
Total future principal payments 56,000  
Less: unamortized debt discount (355)  
Carrying value of long-term debt 55,645  
Less: current portion (10,889)  
Long-term portion $ 44,756