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STOCK-BASED COMPENSATION - Summary of stock options (Details) - Stock options - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
STOCK-BASED COMPENSATION        
Number of shares underlying options exercisable 172,555      
Number of shares underlying options unvested 37,999      
Number of shares underlying options outstanding 210,554      
Weighted-average exercise price per share exercisable $ 16.09      
Weighted-average exercise price per share unvested 21.00      
Weighted-average exercise price per share outstanding $ 16.97 $ 16.92 $ 16.93 $ 16.66
Aggregate intrinsic value exercisable $ 848      
Aggregate intrinsic value outstanding $ 848      
Weighted-average remaining contractual term exercisable (years) 4 years 7 months 6 days      
Weighted-average remaining contractual term unvested (years) 7 years      
Weighted-average remaining contractual term outstanding (years) 5 years