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INTANGIBLE ASSETS - Changes in Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in intangible assets      
Balance at beginning of year $ 16,927    
Balance at end of year 87,879 $ 16,927  
Intangible assets 87,879 16,927  
Cost      
Reconciliation of changes in intangible assets      
Balance at beginning of year 16,927    
Balance at end of year 87,879 16,927  
Intangible assets 87,879 16,927  
R&D assets | Cost      
Reconciliation of changes in intangible assets      
Balance at beginning of year 5,355 5,320  
Additions during the year 402 35  
Amortization charges (50)    
Balance at end of year 5,707 5,355 $ 5,320
Intangible assets 5,707 5,355 5,320
Commercialization Assets [Member] | Cost      
Reconciliation of changes in intangible assets      
Balance at beginning of year 11,572  
Additions during the year   77,585 11,788
Amortization charges (6,985) (216)  
Balance at end of year 82,172 11,572
Intangible assets $ 82,172 $ 11,572