Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue
Net revenue	$ 628,814	$ 891,340	$ 701,440
Sales of fuel cell systems
Revenue
Net revenue	52,110	181,168	207,691
Sales of hydrogen infrastructure
Revenue
Net revenue	69,122	183,606	141,528
Sales of electrolyzers
Revenue
Net revenue	135,504	82,611	28,463
Sales of engineered equipment
Revenue
Net revenue	22,092	32,361	93,489
Services performed on fuel cell systems and related infrastructure
Revenue
Net revenue	52,169	39,093	35,280
Power purchase agreements
Revenue
Net revenue	77,842	63,731	47,183
Fuel delivered to customers and related equipment
Revenue
Net revenue	97,882	66,246	57,196
Sales of cryogenic equipment and liquefiers
Revenue
Net revenue	111,507	231,687	87,761
Other costs of revenue
Revenue
Net revenue	$ 10,586	$ 10,837	$ 2,849