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Accounts receivable, net | 12 Months Ended
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Dec. 31, 2021
Accounts Receivable, after Allowance for Credit Loss [Abstract] |
Accounts receivable, net | Note 4. Ac counts receivable, net Accounts receivable consisted of the following:
(in thousands) |  | December 31, 2021 |  |  | December 31, 2020 |
Trade receivables |  | $ | 38,597 |  |  | $ | 23,691 |
Revenue recognized in excess of billings |  |  | 72,676 |  |  |  | 1,224 |
Other receivables |  |  | 147 |  |  |  | 47 |
Total |  |  | 111,420 |  |  |  | 24,962 |
Allowance for doubtful accounts |  |  | (3,872 | ) |  |  | (1,228 | )
Accounts receivable, net |  | $ | 107,548 |  |  | $ | 23,734 |
Included in total receivables above are amounts billed under retainage provisions totaling $11.6 million and $4.5 million as of December 31, 2021, and 2020, respectively, which are due within the upcoming year. Activity in the allowance for doubtful accounts for each period was as follows:
|  | Year ended December 31, |
(in thousands) |  | 2021 |  |  | 2020 |  |  | 2019 |
Balance at beginning of period |  | $ | 1,228 |  |  | $ | 441 |  |  | $ | — |
Additions charged to earnings |  |  | 4,045 |  |  |  | 787 |  |  |  | 441 |
Write-offs of uncollectible accounts |  |  | (1,401 | ) |  |  | — |  |  |  | — |
Balance at end of period |  | $ | 3,872 |  |  | $ | 1,228 |  |  | $ | 441 |
At December 31, 2021, four customers accounted for 29%, 23%, 19% and 18%, respectively, of total accounts receivable. At December 31, 2020, three customers accounted for 32%, 25% and 14%, respectively, of total accounts receivable. During the year ended December 31, 2021, three customers accounted for 37%, 20% and 15%, respectively of total revenue. During the year ended December 31, 2020, four customers accounted for 21%, 19%, 10% and 10%, respectively, of total revenue. During the year ended December 31, 2019, three customers accounted for 59%, 21% and 13%, respectively, of total revenue.

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- Definition The entire disclosure for accounts receivable, contract receivable, receivable held-for-sale, and nontrade receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI http://asc.fasb.org/topic&trid=2196771 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -URI http://asc.fasb.org/topic&trid=82887179 + Details
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- References No definition available. + Details
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