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Document and Entity Information - shares | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Oct. 31, 2018
Document and Entity Information |  |
Entity Registrant Name | Xencor Inc |
Entity Central Index Key | 0001326732 |
Document Type | 10-Q |
Document Period End Date | Sep. 30, 2018 |
Amendment Flag | false |
Current Fiscal Year End Date | --12-31 |
Entity Current Reporting Status | Yes |
Entity Filer Category | Large Accelerated Filer |
Entity Common Stock, Shares Outstanding |  | 56,234,332
Entity Small Business | false |
Entity Emerging Growth Company | false |
Document Fiscal Year Focus | 2018 |
Document Fiscal Period Focus | Q3 |

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