| Cover | Mar. 18, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 07, 2024 |
| Entity Registrant Name | Neurogene Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36327 |
| Entity Tax Identification Number | 98-0542593 |
| Entity Address, Address Line One | 535 W 24th Street |
| Entity Address, City or Town | New York |
| Entity Address, Address Line Two | 5th Floor |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10011 |
| City Area Code | 877 |
| Local Phone Number | 237-5020 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.000001 par value |
| Trading Symbol | NGNE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001404644 |
