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ACCOUNTS RECEIVABLE, NET AND INVENTORIES - Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Receivables [Abstract]    
Trade accounts receivable $ 31,239 $ 20,252
Allowance for doubtful accounts (581) (918)
Other receivables 4,680 2,292
Total accounts receivable, net $ 35,338 $ 21,626