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Net Loss Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Numerator:        
Net loss attributable to Xencor, Inc. $ (65,963) $ (21,954) $ (133,996) $ (82,717)
Denominator:        
Weighted-average common shares outstanding used in computing basic net loss (in shares) 61,676,444 59,807,558 61,444,384 59,922,784
Weighted-average common shares outstanding used in computing diluted net loss (in shares) 61,676,444 59,807,558 61,444,384 59,922,784
Basic net loss per common share attributable to Xencor, Inc. (in dollars per share) $ (1.07) $ (0.37) $ (2.18) $ (1.38)
Diluted net loss per common share attributable to Xencor, Inc. (in dollars per share) $ (1.07) $ (0.37) $ (2.18) $ (1.38)