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STOCK-BASED COMPENSATION - Summary of stock options (Details) - Stock options - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
STOCK-BASED COMPENSATION        
Number of shares underlying options exercisable 161,355      
Number of shares underlying options unvested 50,199      
Number of shares underlying options outstanding 211,554      
Weighted-average exercise price per share exercisable $ 15.78      
Weighted-average exercise price per share unvested 20.81      
Weighted-average exercise price per share outstanding $ 16.97 $ 16.92 $ 16.96 $ 16.66
Aggregate intrinsic value exercisable $ 425      
Aggregate intrinsic value unvested 2      
Aggregate intrinsic value outstanding $ 427      
Weighted-average remaining contractual term exercisable (years) 4 years 8 months 12 days      
Weighted-average remaining contractual term unvested (years) 7 years 2 months 12 days      
Weighted-average remaining contractual term outstanding (years) 5 years 3 months 18 days