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Business Combination - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2016
Sep. 20, 2016
Sep. 30, 2016
Business Acquisition [Line Items]      
Goodwill impairment     $ 0
Transaction costs incurred in relation to business combination     2,500,000
Viventia Bio Inc.      
Business Acquisition [Line Items]      
Percentage of voting interests acquired   19.90%  
Number of shares issued in business combination (in shares)   4,013,431  
Number of shares placed in escrow (in shares)   401,343  
Value of shares issued   $ 13,500,000  
Consideration transferred using discounted cash flow estimate   21,900,000  
Fair value of consideration transferred   $ 35,400,000  
Deferred tax liability $ 9,774,000   9,774,000
Revenue recognized in a business combination 0    
Operating loss incurred in relation to business combination 500,000    
IPR&D      
Business Acquisition [Line Items]      
Impairment related to IPR&D     0
IPR&D | Viventia Bio Inc.      
Business Acquisition [Line Items]      
Deferred tax liability 9,800,000   9,800,000
Unobservable Inputs (Level 3) | Discounted Cash Flow Approach | Vicinium IPR&D      
Business Acquisition [Line Items]      
Cost of development for the aseet 48,000,000   $ 48,000,000
Unobservable Inputs (Level 3) | Discounted Cash Flow Approach | Proxinium IPR&D      
Business Acquisition [Line Items]      
Discount rate (in percentage)     17.40%
Cost of development for the aseet $ 27,000,000   $ 27,000,000