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Contract Receivables (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Customer
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Customer
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Customer
Components of contract receivables [Abstract]            
Billed receivables   $ 5,319   $ 5,319   $ 11,041
Unbilled receivables   6,239   6,239   6,624
Allowance for doubtful accounts   (415)   (415)   (458)
Total contract receivables, net   11,143   11,143   $ 17,207
Bad debt expense   $ 10 $ 48 103 $ 48  
Unbilled Contract Receivables [Abstract]            
Unbilled contract receivables invoiced       $ (1,195) $ (6,777)  
Contract Receivable [Member]            
Concentration Risk [Abstract]            
Number of customers accounting for contract receivables | Customer   2   2   2
Subsequent Event [Member]            
Unbilled Contract Receivables [Abstract]            
Unbilled contract receivables invoiced $ 2,600          
Maximum [Member] | Contract Receivable [Member]            
Concentration Risk [Abstract]            
Percentage of contract receivables accounted by major customers       9.00%   13.00%
Minimum [Member] | Contract Receivable [Member]            
Concentration Risk [Abstract]            
Percentage of contract receivables accounted by major customers       7.00%   10.00%