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STOCK-BASED COMPENSATION - 2014 Omnibus Incentive Plan (Details) - USD ($)
1 Months Ended 12 Months Ended 25 Months Ended
Dec. 06, 2017
May 31, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, shares issued (in shares)     80,888,134 64,185,224   80,888,134
Performance-based Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of units awarded (in shares)     643,266      
Weighted-average grant date fair value of stock purchase rights granted (in dollars per share)     $ 6.87      
The 2014 Plan | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total fair value of awards vested     $ 3,100,000 $ 3,100,000 $ 3,900,000  
Number of units awarded (in shares)     2,750,408      
Weighted-average grant date fair value of stock purchase rights granted (in dollars per share)     $ 3.84      
Fair value of units awarded at grant date (in dollars per share)     $ 4.64 $ 6.94   $ 4.64
The 2014 Plan | Restricted stock units | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     4 years      
Awards vesting by the end of the first year, percentage (at least)     33.00%      
The 2014 Plan | Restricted stock units | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     3 years      
Awards vesting by the end of the first year, percentage (at least)     25.00%      
The 2014 Plan | Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized under plan (in shares)   15,780,000        
Shares available for future issuance (in shares)     7,233,105     7,233,105
Vesting period   4 years        
The 2014 Plan | Employee Stock Option | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Term of awards (may not exceed)   10 years        
The 2014 Plan | Employee Stock Option | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards vesting by the end of the first year, percentage (at least)   25.00%        
The 2014 Plan | Performance-based Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     3 years      
Number of units awarded (in shares)     643,266      
Weighted-average grant date fair value of stock purchase rights granted (in dollars per share)     $ 6.87      
Fair value of units awarded at grant date (in dollars per share)     $ 8.11 $ 10.14   $ 8.11
The 2014 Plan | Performance-based Restricted Stock Units | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards vesting by the end of the first year, percentage (at least)     200.00%      
The 2014 Plan | Performance-based Restricted Stock Units | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards vesting by the end of the first year, percentage (at least)     0.00%      
CEO | Equity Match Program            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Par value (in dollars per share) $ 0          
Block of common stock purchased value $ 100,000          
Maximum amount of common stock purchased $ 600,000          
Common stock, shares issued (in shares)     75,000     75,000
Average price per share (in dollars per share)     $ 8.16     $ 8.16
CEO | Equity Match Program | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 3 years          
Number of units awarded (in shares)           73,529
Maximum grant date value of RSU $ 100,000          
Fair value of units awarded at grant date (in dollars per share)     $ 8.16     $ 8.16