Quarterly report pursuant to Section 13 or 15(d)

REVENUE RECOGNITION - Schedule of long term trade receivables (Details)

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REVENUE RECOGNITION - Schedule of long term trade receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable, net $ 0 $ 0
Trade Accounts Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note receivable 8,402 4,104
Allowance for losses (118) (292)
Notes receivable, net 8,284 3,812
Notes Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note receivable 118 1,166
Allowance for losses (118) (291)
Notes receivable, net $ 0 $ 875