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Accounts Receivable and Contract Assets (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Accounts Receivable and Contract Assets [Abstract]    
Accounts receivable - customers $ 4,782 $ 5,633
Other receivables 216 206
Accounts receivable 4,998 5,839
Less: allowance for doubtful accounts (792) (655)
Accounts receivable, net 4,206 5,184
Unbilled revenue 3,179 $ 2,847
Change in accounts receivable - customers (851)  
Change in other receivables 10  
Change in accounts receivable (841)  
Change in allowance for doubtful accounts (137)  
Change in accounts receivable, net (978)  
Change in unbilled revenue $ 332