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REVENUE RECOGNITION - Liability for Customer Credits Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Movement in Customer Refundable Fees [Roll Forward]
Customer credits, beginning balance	$ 61,006	$ 13,764
Credits issued	217,407	213,826
Credits redeemed	(178,720)	(147,096)
Breakage revenue recognized	(41,800)	(21,364)
Foreign currency translation	(1,335)	1,876
Customer credits, ending balance	$ 56,558	$ 61,006