v3.19.2
STOCKHOLDERS' EQUITY - Restricted Stock (Details) - Restricted stock - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Restricted Stock          
Outstanding at period start (in shares)     177,293    
Granted (in shares)     139,619    
Forfeited (in shares)     (5,121)    
Vested (in shares)     (4,444)    
Outstanding at period end (in shares) 307,347   307,347   177,293
Weighted-Average Remaining Contractual Terms (in years)     2 years 1 month 6 days   2 years 2 months 12 days
Restricted stock exercisable (in shares) 0   0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Abstract]          
Unrecognized compensation expense $ 6,999   $ 6,999    
Unrecognized compensation expense, weighted average period of recognition (in years)     2 years 1 month 6 days    
General and Administrative Expense          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Abstract]          
Stock-based compensation expense $ 692 $ 454 $ 1,163 $ 2,631