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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Liabilities:    
Notes payable $ 1,891 $ 1,944
Business acquisition contingent consideration 746 0
Carrying Value    
Liabilities:    
Trade receivables, net 1,307 538
Equipment financing receivables 1,161 1,192
Finance lease obligations 367 84
Notes payable 1,891 1,944
Business acquisition contingent consideration 746 0
Estimated Fair Value    
Liabilities:    
Trade receivables, net 1,307 538
Equipment financing receivables 1,161 1,192
Finance lease obligations 367 84
Notes payable 1,891 1,944
Business acquisition contingent consideration $ 746 $ 0