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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION - Stock option activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of options    
Outstanding at the beginning of the period (in shares) 1,468,046  
Forfeited (in shares) (568,132)  
Outstanding at the end of the period (in shares) 899,914 1,468,046
Exercisable at the end of the period (in shares) 557,620  
Weighted average exercise price    
Outstanding at the beginning of the period (in dollars per share) $ 29.19  
Forfeited (in dollars per share) 24.00  
Outstanding at the end of the period (in dollars per share) 32.47 $ 29.19
Exercisable at the end of the period (in dollars per share) $ 28.69  
Weighted average contractual term (in years)    
Weighted average contractual term 5 years 7 months 17 days 4 years 7 months 6 days
Exercisable at the end of the period 5 years 5 months 12 days  
Aggregate intrinsic value (in thousands)    
Aggregate intrinsic value (in dollars) $ 0 $ 94
Exercisable at the end of the period (in dollars) $ 0