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Trade Receivables - Summary of Contract Receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Billed receivables $ 3,630 $ 1,312
Unbilled receivables 241 209
Accounts receivable, factored 2,999 5,508
Total $ 6,870 $ 7,029