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Accounts Receivable and Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Accounts Receivable      
Unbilled revenue $ 22,800   $ 24,100
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at Beginning of Period 741 $ 598  
Expense (Credit) (110) 66  
Write off (15) (34)  
Balance at End of Period $ 616 $ 630