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SIGNIFICANT ACCOUNTING POLICIES - Capital Advance receivable, net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
SIGNIFICANT ACCOUNTING POLICIES        
CA receivable, gross, beginning balance $ 60,636 $ 16,909    
CA extended to customers 265,592 171,126    
Revenue earned but not collected 782 656    
Revenue collected but not earned (656) (122)    
CA collected from customers (259,134) (128,003)    
Exchange rate adjustments 970 170    
Charge-offs, net of recoveries (508) (100)    
CA receivable, gross, ending balance 67,682 60,636    
Allowance for CA losses (1,587) (900) $ (1,593) $ (1,080)
CA receivable, net, ending balance $ 66,095 $ 59,736 $ 72,032 $ 32,410