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Revenues and Trade Receivables, Net, Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, Net [Abstract]      
Accounts receivable $ 4,330 $ 9,094  
Contract and other receivables 3,081 4,363  
Less: allowance for bad debt (40) (124) $ (58)
Less: sales-related allowances (416) (203)  
Trade and other receivables, net $ 6,955 $ 13,130