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ASSET PURCHASE AND LICENSE AGREEMENTS (Details)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Asset Acquisition [Line Items]        
Research and development   $ 23,595   $ 15,476
Asset Purchase Agreement relating to Seribantumab        
Asset Acquisition [Line Items]        
Upfront payment $ 3,500      
Research and development   3,500    
Milestone payments paid   0   $ 0
Asset Purchase Agreement relating to Seribantumab | Maximum        
Asset Acquisition [Line Items]        
Milestone payments payable   $ 54,500    
Dyax        
Asset Acquisition [Line Items]        
Number of days written prior notice to terminate agreement   90 days 90 days  
Dyax | Maximum        
Asset Acquisition [Line Items]        
Milestone payments payable   $ 9,300    
Selexis        
Asset Acquisition [Line Items]        
Number of days written prior notice to terminate agreement   60 days 60 days  
Royalty payments payable | €     € 200,000  
Percentage of royalty on net sales of licensed products   1.00% 1.00%  
Selexis | Maximum        
Asset Acquisition [Line Items]        
Milestone payments payable, per licensed product | €     € 900  
National Institute of Health | Maximum        
Asset Acquisition [Line Items]        
Milestone payments payable   $ 400