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SHARE-BASED COMPENSATION - Outstanding and Exercisable Options (Details) - $ / shares
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Price range of options: from (in dollars per share) $ 0.40  
Price range of options: to (in dollars per share) $ 13.98  
Number of options outstanding (in shares) 723,395 809,000
Weighted Average Remaining Contractual Life 3 years 2 months 12 days  
Weighted Average Exercise Price (in dollars per shares) $ 9.61 $ 8.63
Number of options exercisable (in shares) 574,487  
Options Exercisable, Weighted Average Exercise Price (in dollars per shares) $ 11.77  
Exercise Prices One    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Price range of options: from (in dollars per share) 0.40  
Price range of options: to (in dollars per share) $ 7.01  
Number of options outstanding (in shares) 180,813  
Weighted Average Remaining Contractual Life 4 years 4 months 24 days  
Weighted Average Exercise Price (in dollars per shares) $ 2.28  
Number of options exercisable (in shares) 31,905  
Options Exercisable, Weighted Average Exercise Price (in dollars per shares) $ 6.86  
Exercise Prices Two    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Price range of options: from (in dollars per share) 9.66  
Price range of options: to (in dollars per share) $ 13.98  
Number of options outstanding (in shares) 542,582  
Weighted Average Remaining Contractual Life 2 years 8 months 12 days  
Weighted Average Exercise Price (in dollars per shares) $ 12.06  
Number of options exercisable (in shares) 542,582  
Options Exercisable, Weighted Average Exercise Price (in dollars per shares) $ 12.06