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REVENUE RECOGNITION - Customer Credits (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
USD ($)
Customer Credits [Roll Forward]  
Customer credits, beginning balance $ 13,764
Credits issued 153,638
Credits redeemed (102,373)
Breakage revenue recognized (15,055)
Foreign currency translation 856
Customer credits, ending balance $ 50,830