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Accounts Receivable and Contract Assets (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Accounts Receivable and Contract Assets [Abstract]    
Accounts receivable - customers $ 5,200 $ 4,574
Other receivables 181 152
Accounts receivable 5,381 4,726
Less: allowance for doubtful accounts (410) (305)
Accounts receivable, net 4,971 4,421
Unbilled revenue 2,687 $ 2,276
Change in accounts receivable - customers 626  
Change in other receivables 29  
Change in accounts receivable 655  
Change in allowance for doubtful accounts (105)  
Change in accounts receivable, net 550  
Change in unbilled revenue $ 411