v3.22.2.2
Document and Entity Information
Sep. 27, 2022
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001783183
Document Type 8-K
Document Period End Date Sep. 27, 2022
Entity Registrant Name Phathom Pharmaceuticals, Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-39094
Entity Tax Identification Number 82-4151574
Entity Address, Address Line One 100 Campus Drive
Entity Address, Address Line Two Suite 102
Entity Address, City or Town Florham Park
Entity Address, State or Province NJ
Entity Address, Postal Zip Code 07932
City Area Code (877)
Local Phone Number 742-8466
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.0001 per share
Trading Symbol PHAT
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period true