Warrants - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2022
Class of Warrant or Right [Line Items]
Warrants, exercise price (in dollars per share)	$ 0.35	$ 0.35	$ 0.35	$ 0.35
Public warrants
Class of Warrant or Right [Line Items]
Number of securities called by warrants (in shares)	238,095		238,095
Private warrants
Class of Warrant or Right [Line Items]
Number of securities called by warrants (in shares)	6,667		6,667
Public and private warrants
Class of Warrant or Right [Line Items]
Warrants, exercise price (in dollars per share)	$ 402.50		$ 402.50
Project warrants
Class of Warrant or Right [Line Items]
Number of securities called by warrants (in shares)					26,068
Warrants, exercise price (in dollars per share)					$ 0.35
Class of warrant, fair value of warrants (in dollar per share)					$ 173.60
Vesting of warrants issued in connection with customer agreements	$ 41	$ 100	$ 100	$ 200
Project warrants \| Warrant vested
Class of Warrant or Right [Line Items]
Number of securities called by warrants (in shares)	14,978		14,978
Collaboration warrants
Class of Warrant or Right [Line Items]
Number of securities called by warrants (in shares)					104,275
Warrants, exercise price (in dollars per share)					$ 0.35
Class of warrant, fair value of warrants (in dollar per share)					$ 173.60
Other selling, general and administrative expense		$ 500		$ 1,500
Collaboration warrants \| Warrant vesting, immediately
Class of Warrant or Right [Line Items]
Number of securities called by warrants (in shares)					52,138

Heliogen, Inc. 10-Q