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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Contract receivables | $ 57,560 | $ 57,435
Allowance for doubtful accounts | (3,010) | (3,110)
Total accounts receivable | 65,650 | 63,046
Trade Accounts Receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Trade receivables | $ 11,100 | $ 8,721

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