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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Contract receivables | $ 57,435 | $ 58,881
Allowance for doubtful accounts | (3,110) | (2,582)
Total accounts receivable | 63,046 | 68,434
Trade Accounts Receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Trade receivables | $ 8,721 | $ 12,135

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