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SHARE-BASED COMPENSATION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 20, 2015
Share-based Compensations [Abstract]          
Number of shares authorized for issuance under the equity incentive plan (in shares) 1,052,852 164,937 443,431 1,766,811 2,000,000
Share based compensation expense $ 1.2 $ 7.1      
Unamortized share based compensation expense $ 0.6        
2015 Equity Incentive Award Plan [Member]          
Share-based Compensations [Abstract]          
Number of shares authorized for issuance under the equity incentive plan (in shares) 4,000,000        
2015 Equity Incentive Award Plan [Member] | Employees [Member] | Options [Member]          
Share-based Compensations [Abstract]          
Number of options granted for purchase (in shares) 1,862,000        
2015 Equity Incentive Award Plan [Member] | Employees [Member] | Restricted Stock Units [Member]          
Share-based Compensations [Abstract]          
Number of options granted for purchase (in shares) 141,872