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Debt - Summary of Company's Total Outstanding Borrowings (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Principal amount outstanding $ 100,000 $ 109,375
Less: Deferred financing fees (1,136) (1,576)
Net carrying amount $ 98,864 $ 107,799