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SHARE-BASED COMPENSATION - Summarizes Significant Ranges of Outstanding and Exercisable Options (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Price range of option: from (in dollars per share) $ 0.17  
Price range of option: to (in dollars per share) $ 13.98  
Options outstanding number (in shares) 809,329 543,000
Options outstanding, weighted average remaining contractual term 3 years 7 months 6 days  
Options outstanding, weighted average exercise price (in dollars per share) $ 8.63 $ 12.06
Options, vested and expected to vest, exercisable, number (in shares) 561,550  
Options, vested and expected to vest, exercisable, weighted average exercise price (in dollars per share) $ 11.66  
Exercise prices one    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Price range of option: from (in dollars per share) 0.17  
Price range of option: to (in dollars per share) $ 7.01  
Options outstanding number (in shares) 266,747  
Options outstanding, weighted average remaining contractual term 4 years 6 months  
Options outstanding, weighted average exercise price (in dollars per share) $ 1.67  
Options, vested and expected to vest, exercisable, number (in shares) 18,968  
Options, vested and expected to vest, exercisable, weighted average exercise price (in dollars per share) $ 0.30  
Exercise prices range two    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Price range of option: from (in dollars per share) 9.66  
Price range of option: to (in dollars per share) $ 13.98  
Options outstanding number (in shares) 542,582  
Options outstanding, weighted average remaining contractual term 3 years 2 months 12 days  
Options outstanding, weighted average exercise price (in dollars per share) $ 12.06  
Options, vested and expected to vest, exercisable, number (in shares) 542,582  
Options, vested and expected to vest, exercisable, weighted average exercise price (in dollars per share) $ 12.06