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Accounts Receivable | 12 Months Ended
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Dec. 31, 2022
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable Accounts receivable consists of the following (in thousands):
| December 31,
| 2022 |  | 2021
Accounts receivable | $ | 423,071 |  |  | $ | 236,149 |
Less: allowance for credit losses | (1,888) |  |  | (140) |
Accounts receivable, net | $ | 421,183 |  |  | $ | 236,009 |
Included in accounts receivable are amounts retained by project owners that represent funds withheld by our customers until the products are installed by a third-party, arranged by the customer, and the project is declared operational. Such retention amounts were $47.4 million and $13.5 million as of December 31, 2022 and 2021, respectively. All retention amounts outstanding as of December 31, 2022 are collectible within the next 12 months. The following is the activity of the reserve for credit losses on accounts receivable which includes trade accounts receivable and unbilled accounts receivable (in thousands):
| December 31,
| 2022 |  | 2021
Beginning balance | $ | (140) |  |  | $ | (663) |
Provision for credit losses | (2,599) |  |  | 303 |
Collected | 731 |  |  | 130 |
Written-off | 120 |  |  | 90 |
Ending balance | $ | (1,888) |  |  | $ | (140) |

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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 https://asc.fasb.org/topic&trid=2196771 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -URI https://asc.fasb.org/topic&trid=82887179 + Details
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