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Agreements - CytomX (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 48 Months Ended
Jan. 31, 2014
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2017
Collaborative Agreements disclosures                                                
License and milestone fees   $ 29,580,000 $ 79,000 $ 31,080,000 $ 18,730,000 $ 5,076,000 $ 76,000 $ 76,000 $ 10,077,000 $ 10,692,000 $ 6,070,000 $ 5,086,000 $ 5,078,000 $ 41,417,000 $ 6,234,000   $ 5,152,000 $ 16,762,000 $ 79,469,000 $ 15,305,000 $ 26,915,000 $ 57,815,000    
Costs related to the research and development services   39,843,000 $ 31,689,000 35,319,000 $ 32,888,000 33,657,000 $ 32,909,000 $ 38,652,000 $ 36,094,000 $ 38,199,000 $ 35,132,000 $ 30,437,000 $ 25,666,000 $ 27,647,000 $ 28,018,000   66,566,000 $ 73,331,000 139,739,000 141,312,000 148,077,000 111,768,000    
CytomX                                                
Collaborative Agreements disclosures                                                
Payments received under collaboration agreement $ 13,100,000                                              
License and milestone fees                                     12,700,000          
Potential milestone payments 160,000,000                             $ 160,000,000                
Potential milestone payments to be paid $ 80,000,000                             $ 80,000,000                
Estimated utilization period after commercialization 10 years                             10 years                
Discount rate (as a percent) 13.00%                             13.00%                
Value of collaborators licenses   13,100,000                                 13,100,000         $ 13,100,000
Estimated term of development and commercialization license 25 years                                              
Costs related to the research and development services                                 427,000   256,000   $ 868,000 $ 130,000    
CytomX | Development milestones                                                
Collaborative Agreements disclosures                                                
Payments received under collaboration agreement $ 12,700,000                                              
Potential milestone payments 10,000,000                             $ 10,000,000                
Potential milestone payments to be paid 7,000,000                             7,000,000                
Fair value of consideration for services provided                                               12,700,000
CytomX | Phase 1 clinical trial                                                
Collaborative Agreements disclosures                                                
Potential milestone payments   1,000,000   $ 1,000,000                             1,000,000         1,000,000
Potential milestone payments to be paid   1,000,000       $ 1,000,000                     $ 1,000,000   1,000,000 $ 1,000,000       1,000,000
CytomX | Phase 2 clinical trial                                                
Collaborative Agreements disclosures                                                
Potential milestone payments   3,000,000                                 3,000,000         3,000,000
CytomX | Future Technological Improvements                                                
Collaborative Agreements disclosures                                                
Payments received under collaboration agreement 350,000                                              
Value of collaborators licenses   13,000,000                                 13,000,000         13,000,000
Fair value of consideration for services provided 13,000,000                                             350,000
CytomX | Research Services                                                
Collaborative Agreements disclosures                                                
Payments received under collaboration agreement 140,000                                              
Value of collaborators licenses   $ 140,000                                 $ 140,000         $ 140,000
Fair value of consideration for services provided 140,000                                              
Fair value of consideration for services received 310,000                                           $ 12,800,000  
CytomX | Regulatory milestones                                                
Collaborative Agreements disclosures                                                
Potential milestone payments 50,000,000                             50,000,000                
Potential milestone payments to be paid 23,000,000                             23,000,000                
CytomX | Sales milestones                                                
Collaborative Agreements disclosures                                                
Potential milestone payments 100,000,000                             100,000,000                
Potential milestone payments to be paid $ 50,000,000                             $ 50,000,000