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Borrowings - Schedule of Maturities of Our Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 4,061  
2022 9,145  
2023 25,000  
2024 84,718  
Total principal payments 122,924  
Unamortized discount (665)  
Debt issuance costs (24)  
Total debt — net carrying amount $ 122,235 $ 118,899