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Accounts Receivable | 6 Months Ended
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Jun. 30, 2021
Receivables [Abstract] |
Accounts Receivable | 3. Accounts Receivable
(table only in thousands) |  | June 30, 2021 |  |  | December 31, 2020 |
Contract receivables |  | $ | 57,560 |  |  | $ | 57,435 |
Trade receivables |  |  | 11,100 |  |  |  | 8,721 |
Allowance for doubtful accounts |  |  | (3,010 | ) |  |  | (3,110 | )
Total accounts receivable |  | $ | 65,650 |  |  | $ | 63,046 |
Balances billed but not paid by customers under retainage provisions in contracts within the Condensed Consolidated Balance Sheets amounted to approximately $1.9 million and $1.5 million at June 30, 2021 and December 31, 2020, respectively. Retainage receivables on contracts in progress are generally collected within a year after contract completion. Bad debt expense was approximately $0.1 million and $0.4 million for the three-month periods ended June 30, 2021 and 2020, respectively, and $0.1 million and $0.5 million for the six-month periods ended June 30, 2021 and 2020, respectively.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- References No definition available. + Details
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