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Subsequent Event (Details) - Collaboration And License Agreement - Genentech - Subsequent Events $ in Millions	1 Months Ended
	Feb. 28, 2019 USD ($)
Collaboration research and licensing agreements
Nonrefundable upfront payment	$ 120
Research license term	2 years
XmAb24306
Collaboration research and licensing agreements
Percentage of profits on net sales of the product	45.00%
Collaboration Product Which Advances To Phase 1 Clinical Trials
Collaboration research and licensing agreements
Potential milestone payment	$ 20
Collaboration Product Which Advances To Phase 3 Clinical Trials
Collaboration research and licensing agreements
Potential milestone payment	$ 160

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