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Liability Related to Sale of Future Royalties (Details)
$ in Thousands
1 Months Ended 3 Months Ended 4 Months Ended
Apr. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Liability Related to Sale of Future Royalties        
Royalties on net sales of Kadcyla     $ 4,166  
Percentage of royalty payments if applicable threshold is met 85.00%      
Immunity Royalty Holdings, L.P        
Liability Related to Sale of Future Royalties        
Percentage of royalty payments 100.00%      
Royalties on net sales of Kadcyla $ 235,000      
Royalties on net sales of Kadcyla when royalties to the purchaser reach a specified milestone $ 260,000      
Percentage of royalty payments if applicable threshold is met 15.00%      
Proceeds from sale of future royalties $ 200,000      
Transaction costs incurred during royalty purchase agreement $ 5,900      
Movement in Deferred Revenue [Roll Forward]        
Liability related to sale of future royalties - beginning balance   $ 199,662    
Non cash Kadcyla royalty revenue   (5,684)    
Non cash interest expense recognized   4,851    
Liability related to sale of future royalties - ending balance   $ 198,829   $ 199,662
Effective annual interest rate       9.8