Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION - Narrative (Details)

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STOCK BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2018
Jun. 21, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation     $ 471 $ 222 $ 1,224 $ 641
Options exercised (in shares)         143,026  
Proceeds from exercise of stock options         $ 231 $ 229
Compensation cost not yet recognized     $ 2,600   $ 2,600  
Compensation cost not yet recognized (in years)         2 years 6 months  
Expected dividend yield     0.00% 0.00% 0.00% 0.00%
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 (in shares)     1,558,142   1,558,142  
Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unvested, aggregate intrinsic value     $ 2,300   $ 2,300