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Liability Related to Sale of Future Royalties (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2015
Liability Related to Sale of Future Royalties        
Non-cash royalty revenue related to the sale of future royalties   $ 12,997 $ 8,488  
Kadcyla        
Liability Related to Sale of Future Royalties        
Percentage of royalty payments if applicable threshold is met       85.00%
Change in liability related to sale of future royalties        
Liability related to sale of future royalties, net - beginning balance   123,541    
Royalty payments received and paid   15,137    
Non-cash interest expense recognized   5,699    
Liability related to sale of future royalties, net - ending balance   114,103    
IRH | Kadcyla        
Liability Related to Sale of Future Royalties        
Percentage of royalty payments       100.00%
Percentage of royalty payments if applicable threshold is met       15.00%
Proceeds from sale of future royalties - net   200,000   $ 200,000
Transaction costs for royalty agreements       5,900
Change in liability related to sale of future royalties        
Proceeds from sale of future royalties - net   $ 200,000   200,000
Effective annual interest rate   10.10%    
Current effective interest rate   17.7    
IRH | Kadcyla | Maximum        
Liability Related to Sale of Future Royalties        
Royalties threshold       260,000
IRH | Kadcyla | Minimum        
Liability Related to Sale of Future Royalties        
Royalties threshold       $ 235,000
OMERS | Kadcyla        
Liability Related to Sale of Future Royalties        
Percentage of royalty payments 100.00%      
Non-cash royalty revenue related to the sale of future royalties $ 65,200      
Contingent broker fees 1,500      
Net proceeds from sale of residual rights to receive royalty payments $ 65,200 $ 0