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Accounts Receivable and Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Accounts Receivable      
Unbilled revenue $ 15,400   $ 8,700
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at Beginning of Period 598 $ 837  
Expense 149 574  
Write off (117) (141)  
Balance at End of Period $ 630 $ 1,270