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Document and Entity Information
Sep. 06, 2022
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001673772
Document Type 8-K
Document Period End Date Sep. 06, 2022
Entity Registrant Name RAPT Therapeutics, Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-38997
Entity Tax Identification Number 47-3313701
Entity Address, Address Line One 561 Eccles 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 489-9000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.0001 par value per share
Trading Symbol RAPT
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false