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EVENTS SUBSEQUENT TO DECEMBER 31, 2020 (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Feb. 28, 2021
Jan. 31, 2021
Dec. 31, 2018
Aug. 31, 2018
Mar. 31, 2021
Mar. 11, 2021
Dec. 31, 2020
Disclosure of non-adjusting events after reporting period [line items]              
Agreement amount payable for acquisition of rights             $ 26.6
ADSs              
Disclosure of non-adjusting events after reporting period [line items]              
Number of shares issued     2,857,143 4,166,667      
Proceeds from issuance of shares, gross     $ 20.0 $ 25.0      
Proceeds from issuance of shares     $ 18.4 $ 23.5      
ADSs | Major ordinary share transactions              
Disclosure of non-adjusting events after reporting period [line items]              
Number of shares issued 4,647,433 3,188,776     428,421    
Proceeds from issuance of shares, gross $ 37.0 $ 25.0          
Proceeds from issuance of shares $ 34.8 $ 23.1     $ 3.5    
Movantik | AstraZeneca AB              
Disclosure of non-adjusting events after reporting period [line items]              
Agreement amount payable for acquisition of rights             $ 15.5
Movantik | AstraZeneca AB | Agreement amendment              
Disclosure of non-adjusting events after reporting period [line items]              
Agreement amount payable for acquisition of rights           $ 16.0