| Document and Entity Information | Aug. 29, 2020 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001631650 |
| Document Type | 8-K |
| Document Period End Date | Aug. 29, 2020 |
| Entity Registrant Name | AIMMUNE THERAPEUTICS, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-37519 |
| Entity Tax Identification Number | 45-2748244 |
| Entity Address, Address Line One | 8000 Marina Blvd |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | Brisbane |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94005 |
| City Area Code | (650) |
| Local Phone Number | 614-5200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.0001 par value per share |
| Trading Symbol | AIMT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
