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CONVERTIBLE PREFERRED SHARES AND SHAREHOLDERS' DEFICIT - Repurchase Agreement (Details) - Second Company Repurchase - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2019
Apr. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]          
Number of shares extinguished 2,832,856        
Aggregate carrying amount of shares extinguished     $ 14.3    
Fair value of each share extinguished $ 1.36        
Increase in additional paid-in capital related to the difference between fair value after extinguishment and carrying amount     10.4    
Series C          
Equity, Class of Treasury Stock [Line Items]          
Number of shares repurchased 9,442,858        
Price per share $ 5.30 $ 5.30      
Number of shares extinguished 2,832,856        
Carrying value of each share $ 5.03       $ 2.42
Carrying amount of shares repurchased     47.5    
Adjustment to additional paid-in capital related to excess fair value paid over carrying amount     $ 2.5 $ 9.4  
Aggregate carrying amount of shares extinguished       $ 32.0  
Fair value of each share extinguished $ 1.36