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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 09, 2017
Maximum exposure of indemnification liability $ 13.3  
Gain on Expiration of Indemnity Liability 2.2  
Indemnification Liabilities $ 3.2  
Groupon Latin America [Member]    
Estimated indemnification liability   $ 5.4