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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Mar. 23, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Entity Registrant Name Bolt Biotherapeutics, Inc.    
Entity Central Index Key 0001641281    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   37,813,037  
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period true    
ICFR Auditor Attestation Flag false    
Entity Public Float     $ 51.4
Title of 12(b) Security Common Stock, $0.00001 par value    
Trading Symbol BOLT    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity File Number 001-39988    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 47-2804636    
Entity Address, Address Line One 900 Chesapeake    
Entity Address, Address Line Two Drive    
Entity Address, City or Town Redwood City    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94063    
City Area Code 650    
Local Phone Number 665-9295    
Document Annual Report true    
Document Transition Report false    
Auditor Firm ID 238    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location San Jose, California    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

 

Designated portions of the Proxy Statement relating to registrant’s 2023 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days after the end of fiscal year 2022, are incorporated by reference into Part III of this Annual Report.