Collaborative Agreements - CytomX (Details) - CytomX - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2014	Feb. 29, 2016
Right-to-test agreement
Collaborative Agreements disclosures
Payments received under collaboration agreement	$ 0.0
Development and Commercialization License | Maximum
Collaborative Agreements disclosures
Potential milestone payments		$ 160.0
Development and Commercialization License | Development milestones
Collaborative Agreements disclosures
Potential milestone payments		10.0
Development and Commercialization License | Development milestones | Phase I clinical trial
Collaborative Agreements disclosures
Potential milestone payments		1.0
Development and Commercialization License | Regulatory milestones
Collaborative Agreements disclosures
Potential milestone payments		50.0
Development and Commercialization License | Sales milestones
Collaborative Agreements disclosures
Potential milestone payments		$ 100.0