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STOCK BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jan. 01, 2018
Jun. 21, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 3,100   $ 3,100  
Stock-based compensation     435 $ 211 753 $ 419
Aggregate intrinsic value, exercisable     $ 6,000   $ 6,000  
Expected dividend yield       0.00% 0.00% 0.00%
Options exercised (in shares)     127,087      
Proceeds from exercise of stock options     $ 200   $ 209 $ 201
Compensation cost not yet recognized         2 years 6 months  
Weighted average exercise price (in dollars per share)         $ 2.41  
Weighted average remaining contractual term         9 years 6 months  
2014 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Increase in shares authorized (in shares) 1,385,366 1,000,000        
Percentage of outstanding stock 5.00%          
Number of shares available for issuance     1,558,142   1,558,142  
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted (in shares)         376,667 165,000
Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares)         200,000 200,000