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SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Reserve for doubtful accounts   $ (122) $ (139)
Total accounts receivable $ 4,722 17,843 13,387
Bank Income Receivable Member      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Receivable   13,097 9,225
Other Accounts Receivable Member      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Receivable   $ 4,868 $ 4,301