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Cover
Aug. 04, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 04, 2021
Entity File Number 001-37852
Entity Registrant Name PROTAGONIST THERAPEUTICS, INC.
Entity Central Index Key 0001377121
Entity Tax Identification Number 98-0505495
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One Protagonist Therapeutics, Inc.
Entity Address, Address Line Two 7707 Gateway Blvd.
Entity Address, Address Line Three Suite 140
Entity Address, City or Town Newark
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94560-1160
City Area Code 510
Local Phone Number 474-0170
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.00001
Trading Symbol PTGX
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period true