Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue
Net revenue	$ 173,730	$ 198,711	$ 437,344	$ 669,179
Sales of fuel cell systems
Revenue
Net revenue	8,131	37,650	40,282	138,682
Sales of hydrogen infrastructure
Revenue
Net revenue	11,869	38,225	37,399	145,740
Sales of electrolyzers
Revenue
Net revenue	57,789	26,628	74,169	73,627
Sales of engineered equipment
Revenue
Net revenue	7,302	7,212	15,924	23,784
Services performed on fuel cell systems and related infrastructure
Revenue
Net revenue	14,148	9,290	40,205	27,088
Power purchase agreements
Revenue
Net revenue	20,459	20,068	58,437	44,135
Fuel delivered to customers and related equipment
Revenue
Net revenue	29,791	19,371	77,964	47,391
Sales of cryogenic equipment and liquefiers
Revenue
Net revenue	22,050	35,415	84,450	161,677
Other
Revenue
Net revenue	$ 2,191	$ 4,852	$ 8,514	$ 7,055