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Agreements - Roche (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
May 03, 2019
USD ($)
Mar. 31, 2019
Jan. 31, 2019
USD ($)
May 31, 2000
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2000
USD ($)
item
Collaborative Agreements disclosures                                        
Non-cash royalty revenue related to sale of future royalties                                 $ 47,415 $ 32,154 $ 28,142  
Revenue from contract with customer         $ 44,864 $ 13,281 $ 15,542 $ 8,584 $ 13,416 $ 10,928 $ 9,287 $ 19,815 $ 39,448 $ 8,480 $ 39,020 $ 28,499 82,271 53,446 115,447  
License and milestone fees                                        
Collaborative Agreements disclosures                                        
Revenue from contract with customer         29,551 $ 79 $ 5,079 $ 79 $ 1,747 $ 672 $ 1,321 $ 11,540 $ 29,580 $ 79 $ 31,080 $ 18,730 34,788 15,280 79,469  
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 | Upfront payment                                        
Collaborative Agreements disclosures                                        
Revenue from contract with customer                                       $ 2,000
Roche | License and milestone fees                                        
Collaborative Agreements disclosures                                        
Potential milestone payments                                       44,000
Roche | License and milestone fees | Regulatory milestones                                        
Collaborative Agreements disclosures                                        
Revenue from contract with customer $ 5,000                                      
Roche | Kadcyla                                        
Collaborative Agreements disclosures                                        
Non-cash royalty revenue related to sale of future royalties                                 47,400 $ 32,200 $ 28,100  
Roche | Kadcyla | Development milestones                                        
Collaborative Agreements disclosures                                        
Potential milestone payments                                       13,500
Revenue from contract with customer                                 13,500      
Roche | Kadcyla | Regulatory milestones                                        
Collaborative Agreements disclosures                                        
Potential milestone payments         5,000                       5,000     $ 30,500
Revenue from contract with customer                                 25,500      
Roche | Undisclosed Target                                        
Collaborative Agreements disclosures                                        
Number of undisclosed targets with exclusive licenses | item                                       4
Potential milestone payments                                       $ 38,000
Revenue from contract with customer                                       1,000
Roche | Undisclosed Target | Development milestones                                        
Collaborative Agreements disclosures                                        
Potential milestone payments                                       8,000
Roche | Undisclosed Target | Regulatory milestones                                        
Collaborative Agreements disclosures                                        
Potential milestone payments                                       20,000
Roche | Undisclosed Target | Milestone payments                                        
Collaborative Agreements disclosures                                        
Potential milestone payments                                       $ 10,000
Roche | Undisclosed Target | IND application filed                                        
Collaborative Agreements disclosures                                        
Potential milestone payments         $ 1,000                       $ 1,000      
OMERS | Kadcyla                                        
Collaborative Agreements disclosures                                        
Non-cash royalty revenue related to sale of future royalties     $ 65,200                                  
Percentage of royalty payments   100.00%