Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Narrative (Details)

v3.19.2
STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 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
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) 1.77   1.67
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
Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 6.5    
Unrecognized compensation expense, recognized period 8 months 12 days    
Fair value of vested awards $ 2.6 $ 1.5  
Restricted Stock Awards | Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Restricted Stock Awards | Employees and Executive Officers      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
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) 12,907,410    
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