Quarterly report pursuant to Section 13 or 15(d)


Cover - shares
3 Months Ended
Mar. 31, 2022
May 16, 2022
Document Information [Line Items]    
Document Type 10-Q  
Document Period End Date Mar. 31, 2022  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 001-40209  
Entity Registrant Name Heliogen, Inc.  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001840292  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 85-4204953  
Entity Address, Address Line One 130 West Union Street  
Entity Address, City or Town Pasadena  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 91103  
City Area Code 626  
Local Phone Number 720-4530  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   188,749,042
Common stock    
Document Information [Line Items]    
Title of 12(b) Security Common stock, $0.0001 par value per share  
Trading Symbol HLGN  
Security Exchange Name NYSE  
Document Information [Line Items]    
Title of 12(b) Security Warrants, each whole warrant exercisable for shares of Common stock at an exercise price of $11.50 per share  
Trading Symbol HLGN.W  
Security Exchange Name NYSE