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Accounts Receivables (Tables)
 12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable
The components of accounts receivable, net consisted of the following (in thousands):
December 31,
20212020
Billed accounts receivable$18,586 $12,060 
Unbilled receivables41,374 19,161 
Allowance for doubtful accounts(116)(308)
Accounts receivable, net$59,844 $30,913 
Accounts Receivable, Allowance for Credit Loss
The activities in the allowance for doubtful accounts are set forth below (in thousands):
Balance Beginning
of Year
Bad Debt
Expenses (1)
Write-offs / Recoveries (2)
Balance
End
of Year
Year Ended December 31, 2021$308 $7 $(199)$116 
Year Ended December 31, 2020$720 $(412)$— $308 
Year Ended December 31, 2019$306 $414 $— $720 
(1)Accounts receivable reserves and reversal of allowance for subsequent collections, net
(2)Accounts receivable written-off and subsequent recoveries, net