| Submission | Sep. 12, 2024 |
| Submission [Line Items] | |
| Central Index Key | 0001326732 |
| Registrant Name | Xencor Inc |
| Registration File Number | 333-270030 |
| Form Type | S-3 |
| Submission Type | 424B5 |
| Fee Exhibit Type | EX-FILING FEES |
| Offerings - Offering: 1 | Sep. 12, 2024 USD ($) shares |
| Offering: | |
| Fee Previously Paid | false |
| Rule 457(r) | true |
| Security Type | Equity |
| Security Class Title | Common Stock, par value $0.01 per share |
| Amount Registered | shares | 11,182,600 |
| Proposed Maximum Offering Price per Unit | 18 |
| Maximum Aggregate Offering Price | $ 201,286,800 |
| Fee Rate | 0.01476% |
| Amount of Registration Fee | $ 29,709.94 |
| Offering Note | The registration fee is calculated in accordance with Rule 457(r) of the Securities Act of 1933, as amended. This "Calculation of Filing Fee" table shall be deemed to update the "Calculation of Filing Fee" table filed as Exhibit 107 to the Registrant's Registration Statement on Form S-3 (File No. 333-270030) in accordance with Rules 456(b) and 457(r) under the Securities Act of 1933, as amended. Includes 1,458,600 shares of common stock that the underwriters have an option to purchase and 3,088,888 shares of common stock that are issuable upon the exercise of pre-funded warrants with a warrants sales price of $17.99 per pre-funded warrant and the exercise price of $0.01 per share issuable pursuant to the pre-funded warrants. Pursuant to Securities and Exchange Commission staff interpretation, the entire fee is allocated to the common stock underlying the pre-funded warrants. |
| Fees Summary | Sep. 12, 2024 USD ($) |
| Fees Summary [Line Items] | |
| Total Offering | $ 201,286,800 |
| Previously Paid Amount | 0 |
| Total Fee Amount | 29,709.94 |
| Total Offset Amount | 0 |
| Net Fee | $ 29,709.94 |
| Final Prospectus | false |
