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REVENUE RECOGNITION - Liability for Customer Credits Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Movement in Customer Refundable Fees [Roll Forward]    
Customer credits, beginning balance $ 13,764 $ 15,118
Credits issued 213,826 115,031
Credits redeemed (147,096) (102,682)
Breakage revenue recognized (21,364) (13,699)
Foreign currency translation 1,876 (4)
Customer credits, ending balance $ 61,006 $ 13,764