Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Narrative (Details)

v3.19.1
STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Service and Performance-based Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, weighted average grant date fair value (in dollars per share) $ 2.70   $ 2.70
Shares granted (shares) 0    
Service and Market-based Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, weighted average grant date fair value (in dollars per share) $ 1.75   1.67
Shares granted (shares) 1,249,500    
Service, Performance, and Market-based Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, weighted average grant date fair value (in dollars per share) $ 0.98   $ 0
Shares granted (shares) 1,063,500    
Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 8.3    
Unrecognized compensation expense, recognized period 9 months 18 days    
Restricted Stock Awards | Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (shares) 2,000,000.0 600,000  
2018 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for grant (shares)     15,000,000
Shares available for future awards (shares) 12,509,575    
2018 Equity Incentive Plan | Service and Market-based Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, weighted average grant date fair value (in dollars per share) $ 1.82    
2018 Equity Incentive Plan | Service, Performance, and Market-based Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, weighted average grant date fair value (in dollars per share) $ 0.98    
2013 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future awards (shares) 769,775    
2013 Equity Incentive Plan | Service and Performance-based Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, weighted average grant date fair value (in dollars per share)     $ 2.70
2013 Equity Incentive Plan | Service and Market-based Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, weighted average grant date fair value (in dollars per share)     $ 1.67