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SHARE OPTIONS - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Nov. 11, 2020
Sep. 14, 2020
Apr. 24, 2020
Nov. 10, 2016
Nov. 30, 2016
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share options $ 0.4 $ 0.4 $ 0.8        
Share based compensation cost           $ 0.6 $ 0.3
Exercised (in shares)           190,000 50,000
Compensation costs not yet recognized           $ 0.9 $ 1.6
2016 Share Option Scheme              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued for equity incentive plan (in shares)           190,000 50,000
2016 Share Option Scheme | Share Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of scheme         10 years    
Term of share options 5 years 5 years 5 years 5 years      
Vesting period 3 years 3 years   3 years      
Vesting rate       33.33%      
2016 Share Option Scheme | Share Option | Share-based Payment Arrangement, Tranche One              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting rate         33.33%    
2016 Share Option Scheme | Share Option | Share-based Payment Arrangement, Tranche Two              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting rate         33.33%    
2016 Share Option Scheme | Share Option | Share-based Payment Arrangement, Tranche Three              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting rate         33.33%    
Senior Management              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Exercised (in shares)           100,000 50,000
Share Option | Chief Executive Officer | 2016 Share Option Scheme              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of share options approved for issuance to senior management (in shares)     550,000        
Vesting period     3 years        
Share Option | Chief Financial Officer | 2016 Share Option Scheme              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of share options approved for issuance to senior management (in shares)   275,000          
Share Option | Chief Commercial Officer | 2016 Share Option Scheme              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of share options approved for issuance to senior management (in shares) 275,000            
Share Option | Senior Management | 2016 Share Option Scheme              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of share options approved for issuance to senior management (in shares)       700,000      
Exercise price (in dollars per share)       $ 4.20