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STOCK-BASED COMPENSATION - 2014 Equity Incentive Plan (Details)
May 21, 2014
plan
Dec. 31, 2017
shares
STOCK-BASED COMPENSATION    
Number of plans terminated | plan 2  
Maximum | Stock-based compensation    
STOCK-BASED COMPENSATION    
Aggregate amount of common shares available for grant or subject to outstanding awards under Predecessor Plans   3,293,331
2014 Equity Incentive Plan    
STOCK-BASED COMPENSATION    
Number of new shares available for grant   2,200,000