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Business Combination - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 16,864   $ 0
Viventia Bio Inc.      
Business Acquisition [Line Items]      
Cash and cash equivalents 136    
Prepaid expenses and other assets 1,162    
Property and equipment 867    
Goodwill 16,864 $ 10,312  
Accounts payable (1,163)    
Accrued expenses (1,494)    
Other liabilities (812)    
Deferred tax liability (16,335) (9,774)  
Business Combination, Contingent Consideration, Liability (46,200) (21,900)  
Recognized assets acquired, goodwill, and liabilities assumed, net 59,725    
Viventia Bio Inc. | Vicinium | In Process Research and Development      
Business Acquisition [Line Items]      
In-process research and development   35,400  
Viventia Bio Inc. | Proxinium | In Process Research and Development      
Business Acquisition [Line Items]      
In-process research and development 0 $ 800  
Viventia Bio Inc. | United States | Vicinium | In Process Research and Development      
Business Acquisition [Line Items]      
In-process research and development 12,200    
Viventia Bio Inc. | European Union | Vicinium | In Process Research and Development      
Business Acquisition [Line Items]      
In-process research and development 41,100    
Viventia Bio Inc. | R.O.W. | Vicinium | In Process Research and Development      
Business Acquisition [Line Items]      
In-process research and development $ 7,200