Revenue - Estimated future revenue (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Revenue
Total estimated future revenue	$ 1,203,186
Sales of fuel cell systems
Revenue
Total estimated future revenue	48,354
Sale of hydrogen installations and other infrastructure
Revenue
Total estimated future revenue	32,927
Sale of electrolyzers
Revenue
Total estimated future revenue	295,647
Sales of engineered equipment
Revenue
Total estimated future revenue	14,457
Services performed on fuel cell systems and related infrastructure
Revenue
Total estimated future revenue	121,524
Power purchase agreements
Revenue
Total estimated future revenue	439,429
Fuel delivered to customers and related equipment
Revenue
Total estimated future revenue	99,234
Sales of cryogenic equipment and other
Revenue
Total estimated future revenue	$ 151,614
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)	10 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