Document and Entity Information - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2021

Mar. 04, 2022

Jun. 30, 2021

Cover [Abstract]

Document Type

10-K

Amendment Flag

false

Document Period End Date

Dec. 31, 2021

Document Fiscal Year Focus

2021

Document Fiscal Period Focus

FY

Trading Symbol

RAPT

Entity Registrant Name

RAPT THERAPEUTICS, INC.

Entity Central Index Key

0001673772

Current Fiscal Year End Date

--12-31

Entity Filer Category

Non-accelerated Filer

Entity Small Business

true

Entity Emerging Growth Company

true

Entity Ex Transition Period

false

Entity Current Reporting Status

Yes

Entity Shell Company

false

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

Entity Common Stock, Shares Outstanding

29,573,318

Entity Interactive Data Current

Yes

Title of 12(b) Security

Common Stock, par value $0.0001 per share

Security Exchange Name

NASDAQ

Entity Incorporation, State or Country Code

DE

Document Annual Report

true

Document Transition Report

false

Entity Well-known Seasoned Issuer

No

Entity Voluntary Filers

No

ICFR Auditor Attestation Flag

false

Entity Public Float

$ 622

Auditor Firm ID

42

Auditor Name

Ernst & Young LLP

Auditor Location

Redwood City, California

Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant’s Definitive Proxy Statement for the 2022 Annual Meeting of Stockholders to be filed with the U.S. Securities and Exchange Commission pursuant to Regulation 14A within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K are incorporated by reference in Part III, Items 10-14 of this Annual Report on Form 10-K.