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DESCRIPTION OF BUSINESS (Details)
$ in Millions
1 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2021
segment
Variable Interest Entity [Line Items]    
Number of operating segments | segment   1
Viventia Bio, Inc.    
Variable Interest Entity [Line Items]    
Shares of common stock issued to the selling shareholders (in shares) | shares 4,000,000  
Percentage of voting interests acquired (as a percent) 19.90%  
One-time milestone payment upon first sale of product $ 12.5  
Period during which quarterly earn-outs are payable after date of net sales 15 years  
Period in which acquiree is to use commercially reasonable efforts to achieve marketing authorizations 7 years  
Viventia Bio, Inc. | Vicinium | Collaborative Arrangement, Revenue based on Specified Milestone    
Variable Interest Entity [Line Items]    
Percentage of net sales of quarterly earn-out payments during earn-out periods 2.00%  
Viventia Bio, Inc. | Vicinium | Europe | Collaborative Arrangement, Revenue based on Specified Milestone    
Variable Interest Entity [Line Items]    
One-time milestone payment upon first sale of product $ 7.0  
Viventia Bio, Inc. | Vicinium | Japan | Collaborative Arrangement, Revenue based on Specified Milestone    
Variable Interest Entity [Line Items]    
One-time milestone payment upon first sale of product $ 3.0