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DESCRIPTION OF BUSINESS (Details)
shares in Millions, $ in Millions
1 Months Ended
Sep. 30, 2016
USD ($)
shares
Apr. 30, 2018
patient
Variable Interest Entity [Line Items]    
Number of patients | patient   133
Viventia Bio Inc.    
Variable Interest Entity [Line Items]    
Shares of common stock issued to the selling shareholders (in shares) | shares 4.0  
Percentage of voting interests acquired 19.90%  
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 | Collaborative Arrangement, Revenue based on Specified Milestone | UNITED STATES    
Variable Interest Entity [Line Items]    
One-time milestone payment upon first sale of product $ 12.5  
Viventia Bio Inc. | Vicinium | Collaborative Arrangement, Revenue based on Specified Milestone | Europe    
Variable Interest Entity [Line Items]    
One-time milestone payment upon first sale of product 7.0  
Viventia Bio Inc. | Vicinium | Collaborative Arrangement, Revenue based on Specified Milestone | Japan    
Variable Interest Entity [Line Items]    
One-time milestone payment upon first sale of product $ 3.0