Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Weighted-average Assumptions (Details)

v3.22.1
SHARE-BASED COMPENSATION - Weighted-average Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield 0.00% 0.00%
Market-based Restricted Share Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 0.52%  
Expected dividend yield 0.00%  
Expected volatility 90.00%  
Grant date share price (USD per share) $ 13.68  
Minimum | Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 0.78% 0.22%
Expected volatility 75.00% 85.00%
Expected life (in years) 5 years 1 month 20 days
Minimum | Market-based Restricted Share Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life (in years) 1 year 3 months 18 days  
Maximum | Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 1.09% 0.41%
Expected volatility 90.00% 90.00%
Expected life (in years) 6 years 3 months 5 years
Maximum | Market-based Restricted Share Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life (in years) 3 years 9 months 18 days