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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - Restricted stock - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Restricted Stock          
Outstanding at period start (in shares)       177,293  
Granted (in shares)       154,269  
Forfeited (in shares)       (9,616)  
Vested (in shares)       (4,444)  
Outstanding at period end (in shares) 317,502     317,502  
Weighted-Average Remaining Contractual Terms     2 years 2 months 12 days 1 year 10 months 24 days  
Restricted stock exercisable (in shares) 0     0  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Abstract]          
Unrecognized compensation expense $ 6,823     $ 6,823  
Unrecognized compensation expense, weighted average period of recognition       1 year 10 months 24 days  
General and Administrative Expense          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Abstract]          
Stock-based compensation expense $ 733 $ 267   $ 1,896 $ 2,899