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Revenue and Related Matters - Summary of Allowance for Expected Credit Losses on Accounts Receivable (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
Receivables [Abstract]  
Balance at December 31, 2020 $ 610
Provision for expected credit losses 237
Write-offs (40)
Balance at September 30, 2021 $ 807