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Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (68,782)		$ (21,954)		$ (142,898)	$ (82,717)
Net unrealized gain (loss) on marketable debt securities	(498)		1,765		(1,942)	5,093
Comprehensive loss	(69,280)	$ (75,561)	(20,189)	$ (57,436)	(144,840)	(77,624)
Comprehensive loss attributable to non-controlling interest	(1,445)		0		(2,121)	0
Comprehensive loss attributable to Xencor, Inc.	$ (67,835)		$ (20,189)		$ (142,719)	$ (77,624)

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