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Revenues - Trade Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 15,279 $ 13,125
Trade Accounts Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 13,138 12,241
Less: Allowance for doubtful accounts (5) (37)
Total $ 13,133 $ 12,204