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Cover - shares
 6 Months Ended
Jun. 30, 2023
Jul. 28, 2023
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2023  
Document Transition Report false  
Entity File Number 001-36182  
Entity Registrant Name Xencor, Inc  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-1622502  
Entity Address, Address Line One 465 North Halstead Street, Suite 200  
Entity Address, City or Town Pasadena  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 91107  
City Area Code 626  
Local Phone Number 305-5900  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol XNCR  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   60,613,236
Entity Central Index Key 0001326732  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q2  
Amendment Flag false