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Accounts Receivable and Contract Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accounts Receivable and Contract Assets [Abstract]    
Accounts receivable - customers $ 5,034 $ 5,633
Other receivables 455 206
Accounts receivable 5,489 5,839
Less: allowance for doubtful accounts (855) (655)
Accounts receivable, net 4,634 5,184
Unbilled revenue 2,784 $ 2,847
Change in accounts receivable - customers (599)  
Change in other receivables 249  
Change in accounts receivable (350)  
Change in allowance for doubtful accounts (200)  
Change in accounts receivable, net (550)  
Change in unbilled revenue $ (63)