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SHARE-BASED COMPENSATION - Outstanding and Exercisable Options (Details) - $ / shares
shares in Thousands
9 Months Ended
Sep. 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) 694 809
Weighted Average Remaining Contractual Life 2 years 10 months 24 days  
Weighted Average Exercise Price (in dollars per shares) $ 10.00 $ 8.63
Number of options exercisable (in shares) 596  
Options Exercisable, Weighted Average Exercise Price (in dollars per shares) $ 11.48  
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) 152  
Weighted Average Remaining Contractual Life 4 years 7 months 6 days  
Weighted Average Exercise Price (in dollars per shares) $ 2.63  
Number of options exercisable (in shares) 54  
Options Exercisable, Weighted Average Exercise Price (in dollars per shares) $ 5.54  
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  
Weighted Average Remaining Contractual Life 2 years 6 months  
Weighted Average Exercise Price (in dollars per shares) $ 12.06  
Number of options exercisable (in shares) 542  
Options Exercisable, Weighted Average Exercise Price (in dollars per shares) $ 12.06