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Equity and Loss Per Share - Narrative (Details) - shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Preferred stock, shares authorized 10,000,000   10,000,000  
Preferred stock, shares outstanding 0 117,886,982 0 117,886,982
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation (in shares) 37,429,240 33,055,931    
RSU Awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation (in shares) 5,150,369 1,374,446    
Restricted shares        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation (in shares) 399,513      
Warrants | Public Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation (in shares) 8,566,666 229,841    
Warrants | Legacy Heliogen preferred stock warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation (in shares)   381,306    
Convertible preferred stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation (in shares)   117,886,982    
Antidilutive securities, as converted basis (in shares)   121,038,967