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SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 22, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]        
Stock options granted in period (in shares)   442,956 738,893 449,537
Grants in period, weighted average exercise price (in dollars per share)   $ 1.75 $ 2.34 $ 2.13
Subsequent Event        
Subsequent Event [Line Items]        
Grants in period, weighted average exercise price (in dollars per share) $ 2.92      
Employee Stock Option        
Subsequent Event [Line Items]        
Stock options granted in period (in shares)   420,000 740,000 450,000
Award vesting period   2 years    
Employee Stock Option | Subsequent Event        
Subsequent Event [Line Items]        
Stock options granted in period (in shares) 350,000      
Award vesting period 5 years      
Employee Stock Option | Share-based Compensation Award, Tranche One | Subsequent Event        
Subsequent Event [Line Items]        
Award vesting rights, percentage 50.00%      
Employee Stock Option | Share-based Compensation Award, Tranche Two | Subsequent Event        
Subsequent Event [Line Items]        
Award vesting rights, percentage 25.00%      
Employee Stock Option | Share-based Compensation Award, Tranche Three | Subsequent Event        
Subsequent Event [Line Items]        
Award vesting rights, percentage 25.00%      
Stock Appreciation Rights (SARs) | Subsequent Event        
Subsequent Event [Line Items]        
Stock options granted in period (in shares) 2,200,000      
Award vesting period 5 years      
Grants in period, weighted average exercise price (in dollars per share) $ 2.92      
Stock Appreciation Rights (SARs) | Share-based Compensation Award, Tranche One | Subsequent Event        
Subsequent Event [Line Items]        
Grants in period, weighted average exercise price (in dollars per share) $ 5.00      
Share-based Compensation Arrangement by Share-based Payment Award, Period Of Exercise Price 90 days      
Stock Appreciation Rights (SARs) | Share-based Compensation Award, Tranche Two | Subsequent Event        
Subsequent Event [Line Items]        
Grants in period, weighted average exercise price (in dollars per share) $ 7.00      
Share-based Compensation Arrangement by Share-based Payment Award, Period Of Exercise Price 90 days      
Stock Appreciation Rights (SARs) | Share-based Compensation Award, Tranche Three | Subsequent Event        
Subsequent Event [Line Items]        
Grants in period, weighted average exercise price (in dollars per share) $ 10.00      
Share-based Compensation Arrangement by Share-based Payment Award, Period Of Exercise Price 90 days      
Restricted Stock Units (RSUs)        
Subsequent Event [Line Items]        
Shares granted in share-based compensation awards (in shares)   1,190,000 1,390,000 1,210,000
Award vesting period   3 years    
Restricted Stock Units (RSUs) | Subsequent Event        
Subsequent Event [Line Items]        
Shares granted in share-based compensation awards (in shares) 720,000      
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Four | Subsequent Event        
Subsequent Event [Line Items]        
Award vesting rights, percentage 50.00%      
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Five | Subsequent Event        
Subsequent Event [Line Items]        
Award vesting rights, percentage 25.00%      
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Six | Subsequent Event        
Subsequent Event [Line Items]        
Award vesting rights, percentage 25.00%      
At The Market Sale Of Stock        
Subsequent Event [Line Items]        
Sale of stock, number of shares issued (in shares)   14,283,254   200,225
Sale of stock consideration received   $ 32,190 $ 14,550 $ 540