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Debt - Scheduled Future Payments on Term Loan (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Less: current portion $ 0 $ (1,556)
Long-term portion 56,940 $ 53,995
SVB Term Loan    
Debt Instrument [Line Items]    
2021 0  
2022 3,222  
2023 19,333  
2024 19,333  
2025 16,112  
Total future principal payments 58,000  
Less: unamortized debt discount (1,060)  
Carrying value of long-term debt 56,940  
Less: current portion 0  
Long-term portion $ 56,940