| Document and Entity Information | Dec. 13, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 13, 2023 |
| Entity Registrant Name | NEUROGENE INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36327 |
| Entity Tax Identification Number | 98-0542593 |
| Entity Address Address Line 1 | 535 W 24th Street |
| Entity Address Address Line 2 | 5th Floor |
| Entity Address City Or Town | New York |
| Entity Address State Or Province | NY |
| Entity Address Postal Zip Code | 10011 |
| City Area Code | 877 |
| Local Phone Number | 237-5020 |
| Entity Information Former Legal Or Registered Name | Neoleukin Therapeutics, Inc. |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.000001 per share |
| Trading Symbol | NGNE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Current Fiscal Year End Date | --12-31 |
| Entity Central Index Key | 0001404644 |
| Amendment Flag | false |
| Former Address [Member] | |
| Document Information [Line Items] | |
| Entity Address Address Line 1 | 188 East Blaine Street |
| Entity Address Address Line 2 | Suite 450 |
| Entity Address City Or Town | Seattle |
| Entity Address State Or Province | WA |
| Entity Address Postal Zip Code | 98102 |
