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Accounts Receivable (Details) - Schedule of accounts receivable - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of accounts receivable [Abstract]      
Accounts receivable $ 72,039 $ 81,345 $ 73,178
Allowance for doubtful accounts (4,796) (5,047) (5,537)
Accounts receivable, net $ 67,243 $ 76,298 $ 67,641