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Agreements - Roche (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2019
May 31, 2000
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Collaborative Agreements disclosures            
Non-cash royalty revenue related to sale of future royalties         $ 27,072 $ 18,900
Revenue previously deferred     $ 945 $ 79 1,228 158
Revenue from contract with customer     15,025 15,542 28,312 24,126
Milestone payments            
Collaborative Agreements disclosures            
Revenue previously deferred         39,000  
License and milestone fees            
Collaborative Agreements disclosures            
Revenue from contract with customer     945 5,079 1,228 5,158
Roche            
Collaborative Agreements disclosures            
Period in arrears to receive royalty reports and payments related to sales of Kadcyla   3 months        
Percentage of royalty payments 100.00%          
Roche | License and milestone fees | Regulatory milestones            
Collaborative Agreements disclosures            
Revenue previously deferred       $ 5,000   5,000
Roche | Kadcyla            
Collaborative Agreements disclosures            
Non-cash royalty revenue related to sale of future royalties         27,100 $ 18,900
Roche | Kadcyla | Regulatory milestones            
Collaborative Agreements disclosures            
Potential milestone payments     5,000   5,000  
OMERS | Kadcyla            
Collaborative Agreements disclosures            
Non-cash royalty revenue related to sale of future royalties $ 65,200          
Percentage of royalty payments 100.00%          
Maximum | Roche | Milestone payments            
Collaborative Agreements disclosures            
Potential milestone payments     $ 44,000   $ 44,000