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Borrowings - Schedule of Amortization of Premium and Accretion of Debt Issuance Costs (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Amortization of debt premium   $ (1,049)
Amortization of debt discount $ 268 295
Accretion expense — debt issuance cost $ (101) $ (111)