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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2020
Dec. 31, 2017
Recorded Unconditional Purchase Obligation [Line Items]    
Gain on expiration of indemnity liability $ 0.4  
Indemnification liabilities 2.8  
Maximum exposure of indemnification liability $ 11.7  
Groupon Latin America    
Recorded Unconditional Purchase Obligation [Line Items]    
Estimated indemnification liability   $ 5.4