Document and Entity Information |
Jul. 08, 2022 |
|---|---|
| Cover [Abstract] | |
| Entity Registrant Name | AILERON THERAPEUTICS INC |
| Security Exchange Name | NASDAQ |
| Amendment Flag | false |
| Entity Central Index Key | 0001420565 |
| Document Type | 8-K |
| Document Period End Date | Jul. 08, 2022 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38130 |
| Entity Tax Identification Number | 13-4196017 |
| Entity Address, Address Line One | 285 Summer Street |
| Entity Address, Address Line Two | Unit 101 |
| Entity Address, City or Town | Boston |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02210 |
| City Area Code | (617) |
| Local Phone Number | 995-0900 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.001 par value per share |
| Trading Symbol | ALRN |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |