Revenue - Estimated future revenue (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Revenue
Total estimated future revenue	$ 1,181,706
Sales of fuel cell systems
Revenue
Total estimated future revenue	38,234
Sale of hydrogen installations and other infrastructure
Revenue
Total estimated future revenue	31,876
Sale of electrolyzers
Revenue
Total estimated future revenue	303,038
Sales of engineered equipment
Revenue
Total estimated future revenue	18,500
Services performed on fuel cell systems and related infrastructure
Revenue
Total estimated future revenue	126,814
Power purchase agreements
Revenue
Total estimated future revenue	375,802
Fuel delivered to customers and related equipment
Revenue
Total estimated future revenue	93,798
Sale of cryogenic equipment
Revenue
Total estimated future revenue	$ 193,644
Maximum | Sales of fuel cell systems
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	1 year
Maximum | Sale of hydrogen installations and other infrastructure
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	1 year
Maximum | Services performed on fuel cell systems and related infrastructure
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	7 years
Maximum | Power purchase agreements
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	10 years
Minimum | Services performed on fuel cell systems and related infrastructure
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	5 years
Minimum | Power purchase agreements
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	5 years