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REVENUE RECOGNITION - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]          
Deferred revenue $ 17,600   $ 17,600   $ 18,000
Revenue recognized previously recorded in deferred revenue     17,800    
Customer credits, beginning balance     13,764    
Credits issued     98,768    
Credits redeemed     (59,583)    
Breakage revenue recognized     (9,183)    
Foreign currency translation     45    
Customer credits, ending balance 43,811   43,811    
Amortization of deferred contract costs 4,000 $ 5,100 8,700 $ 10,500  
Revenue constrained and to be recognized in future periods $ 22,200   $ 22,200   $ 14,600