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Restatement of Previously Issued Financial Statements - Comprehensive Loss (Details) - 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
Reclassification [Line Items]            
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 income (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)
As Reported            
Reclassification [Line Items]            
Net loss (67,408)       (136,117)  
Net unrealized gain (loss) on marketable debt securities (498)       (1,942)  
Comprehensive income (loss) (67,906)       (138,059)  
Comprehensive loss attributable to non-controlling interest (1,445)       (2,121)  
Comprehensive loss attributable to Xencor, Inc. (66,461)       (135,938)  
Adjustment            
Reclassification [Line Items]            
Net loss (1,374)       (6,781)  
Net unrealized gain (loss) on marketable debt securities 0       0  
Comprehensive income (loss) (1,374)       (6,781)  
Comprehensive loss attributable to non-controlling interest 0       0  
Comprehensive loss attributable to Xencor, Inc. $ (1,374)       $ (6,781)