Document and Entity Information |
Sep. 29, 2025 |
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| Cover [Abstract] | |
| Entity Registrant Name | ENANTA PHARMACEUTICALS INC |
| Amendment Flag | false |
| Entity Central Index Key | 0001177648 |
| Document Type | 8-K |
| Document Period End Date | Sep. 29, 2025 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-35839 |
| Entity Tax Identification Number | 04-3205099 |
| Entity Address, Address Line One | 4 Kingsbury Avenue |
| Entity Address, City or Town | Watertown |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02472 |
| City Area Code | (617) |
| Local Phone Number | 607-0800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | ENTA |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
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- Definition For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD. No definition available.
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- Definition Address Line 1 such as Attn, Building Name, Street Name No definition available.
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