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STOCK-BASED COMPENSATION - Additional Information - Stock Options (Details) - Stock option plans - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
STOCK OPTION PLANS        
Number of shares underlying options exercisable 141,122      
Number of shares underlying options unvested 119,200      
Number of shares underlying options outstanding 260,322      
Weighted-average exercise price per share exercisable $ 12.92      
Weighted-average exercise price per share unvested 19.66      
Weighted-average exercise price per share outstanding $ 16.00 $ 16.00 $ 12.77 $ 12.80
Aggregate intrinsic value exercisable $ 2,332      
Aggregate intrinsic value unvested 1,166      
Aggregate intrinsic value outstanding $ 3,498      
Weighted-average contractual term exercisable (years) 4 years 7 months 6 days      
Weighted-average contractual term unvested (years) 8 years 6 months      
Weighted-average contractual term outstanding (years) 6 years 4 months 24 days