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Out-License Of Zevalin In Certain Ex-U.S. Territories To Mundipharma (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 16, 2015
Mar. 31, 2016
Dec. 31, 2015
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Deferred revenue   $ 2,908 $ 6,513
Zevalin Rights [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Potential payment $ 2,000    
Zevalin Rights [Member] | Total Consideration [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Total consideration received 18,000    
Milestone net sales achievement     $ 15,000
Zevalin Rights [Member] | Payment One [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Total consideration received 15,000    
Zevalin Rights [Member] | Payment Two [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Total consideration received 3,000    
Milestone net sales achievement   400  
Deferred revenue   $ 2,500  
Mundipharma [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Payments for sale of business $ (2,200)