Quarterly report pursuant to Section 13 or 15(d)

Receivables and Current Assets - Summary of Company's Allowance for Expected Credit Losses (Detail)

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Receivables and Current Assets - Summary of Company's Allowance for Expected Credit Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Receivables And Current Assets [Abstract]        
Beginning balance $ 2,934 $ 1,571 $ 2,916 $ 1,555
Write-offs (532) (2,085) (472)
Increase in provision 107 711 1,678 1,199
Ending balance $ 2,509 $ 2,282 $ 2,509 $ 2,282