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Accounts Receivable
 12 Months Ended
Dec. 31, 2024
Receivables [Abstract]  
Accounts Receivable Accounts Receivable
Accounts receivable consists of the following (in thousands):
December 31,
202420232022
Accounts receivable$280,686 $335,976 $423,071 
Less: allowance for credit losses(4,848)(3,824)(1,888)
Accounts receivable, net$275,838 $332,152 $421,183 

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 $17.4 million, $24.0 million, and $47.4 million as of December 31, 2024, 2023, and 2022, respectively. All retention amounts outstanding as of December 31, 2024, are collectible within the next 12 months.

The following is the activity of the allowance for credit losses on accounts receivable which includes trade accounts receivable and unbilled accounts receivable (in thousands):
December 31,
202420232022
Beginning balance$(3,824)$(1,888)$(140)
Provision for credit losses(1,855)(2,871)(2,599)
Collected92 916 731 
Written-off739 19 120 
Ending balance$(4,848)$(3,824)$(1,888)