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Document and Entity Information
Jan. 13, 2025
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001984086
Document Type 8-K
Document Period End Date Jan. 13, 2025
Entity Incorporation State Country Code DE
Entity File Number 001-42382
Entity Tax Identification Number 84-3891440
Entity Registrant Name Septerna, Inc.
Entity Address, Address Line One Septerna
Entity Address, Address Line Two Inc.
Entity Address, Address Line Three 250 East Grand Avenue
Entity Address, City or Town South San Francisco
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94080
City Area Code (650)
Local Phone Number 338-3533
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 SEPN
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false