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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract receivables	$ 61,675	$ 57,435
Allowance for doubtful accounts	(3,403)	(3,110)
Total accounts receivable	70,024	63,046
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 11,752	$ 8,721

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