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Revenues and Trade Receivables, Net, Trade and other receivables, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues and Trade Receivables, Net [Abstract]      
Trade receivables $ 9,626 $ 4,330  
Contract and other receivables 3,177 3,081  
Less: allowance for doubtful accounts (40) (40) $ (124)
Less: sales-related allowances (636) (416)  
Trade and other receivables, net $ 12,127 $ 6,955