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Accounts receivable, net (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounts Receivable, after Allowance for Credit Loss [Abstract] |
Schedule of Accounts 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 |
Summary of changes in the Allowance for Doubtful Trade Receivables | 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 |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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