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STOCK BASED COMPENSATION - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 21, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Jul. 10, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation   $ 211 $ 311 $ 419 $ 453    
Aggregate intrinsic value, outstanding   3,900   3,900      
Aggregate intrinsic value, exercisable   $ 3,900   3,900      
Options exercised during period (in shares)   120,000          
Proceeds from exercise of stock options   $ 200   201 $ 76    
Compensation cost not yet recognized   $ 700   $ 700      
Weighted-average period to recognized compensation cost       1 year 3 months 24 days      
Weighted-average exercise price (in dollars per share)   $ 2.27   $ 1.49      
Weighted-average contractual term, options granted       10 years      
Expected dividend yield   0.00% 0.00% 0.00% 0.00%    
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options granted (in shares)   10,000   165,000      
Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
RSUs granted (in shares)   0   200,000      
2014 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock authorized for issuance (in shares)             2,196,836
Increase in shares authorized (in shares) 1,000,000            
Number of shares available for issuance   1,836,488   1,836,488      
2014 Plan | Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
RSUs issued (in shares)       1,036,872      
RSUs outstanding (in shares)   317,311   317,311      
2014 Plan | Restricted Stock Units | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period (in years)       3 years      
2014 Plan | Restricted Stock Units | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period (in years)       4 years      
2013 and 2014 Plans | Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options outstanding (in shares)   1,652,347   1,652,347   1,607,347  
Options granted (in shares)       165,000      
Options exercised during period (in shares)       120,000      
One year anniversary | 2014 Plan | Restricted Stock Units | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       25.00%      
One year anniversary | 2014 Plan | Restricted Stock Units | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       33.33%