v3.25.2
Cover
Aug. 14, 2025
Entity Addresses [Line Items]  
Document Type 8-K
Document Period End Date Aug. 14, 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
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