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Cover
Dec. 31, 2025
Oct. 17, 2025
Entity Addresses [Line Items]    
Document Type   8-K
Document Period End Date   Oct. 17, 2025
Entity Registrant Name   Bolt Projects Holdings, Inc.
Entity Incorporation, State or Country Code   DE
Entity File Number   001-40223
Entity Tax Identification Number   86-1256660
Entity Address, Address Line One   2261 Market Street
Entity Address, Address Line Two   Suite 5447
Entity Address, City or Town   San Francisco
Entity Address, State or Province   CA
Entity Address, Postal Zip Code   94114
Local Phone Number   325-5912
City Area Code   415
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false
Entity Emerging Growth Company   true
Entity Ex Transition Period   false
Amendment Flag   false
Entity Central Index Key   0001841125
Current Fiscal Year End Date --12-31  
Common stock, par value $0.0001 per share    
Entity Addresses [Line Items]    
Title of 12(b) Security   Common stock, par value $0.0001 per share
Trading Symbol   BSLK
Security Exchange Name   NASDAQ
Warrants, each 20 whole warrants exercisable for one share of Common stock at an exercise price of $230.00    
Entity Addresses [Line Items]    
Title of 12(b) Security   Warrants, each 20 whole warrants exercisable for one share of Common stock at an exercise price of $230.00
Trading Symbol   BSLKW
Security Exchange Name   NASDAQ