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SHARE CAPITAL AND SHARE BASED COMPENSATION - Time based RSU's (Details) - Time based restricted stock units - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share options:    
Award vesting period (in years) 3 years  
Nonvested, Number of Shares    
Non vested RSU's starting balance (in shares) 223  
Granted during the year (in shares) 667 200
Vested during the year (in shares) (73)  
Forfeited during the year (in shares) (69)  
Non vested RSU's ending balance (in shares) 748 223
Weighted average grant date fair value per share    
Non vested RSU's starting balance (in dollars per share) $ 20.61  
Granted during the year (in dollars per share) 7.51  
Vested during the year (in dollars per share) 20.61  
Forfeited during the year (in dollars per share) 7.87  
Non vested RSU's ending balance (in dollars per share) $ 10.02 $ 20.61
Remaining performance period (in years) 2 years 2 years 4 months 24 days