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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - Software
7 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
May 31, 2016
May 31, 2015
Minimum        
Property, Plant and Equipment [Line Items]        
Range of useful lives in years 2 years 2 years 2 years 2 years
Maximum        
Property, Plant and Equipment [Line Items]        
Range of useful lives in years 10 years 10 years 10 years 10 years