Revenue - Estimated future revenue (Details) $ in Thousands	6 Months Ended
Jun. 30, 2024 USD ($)
Revenue
Total estimated future revenue	$ 1,102,602
Sales of fuel cell systems
Revenue
Total estimated future revenue	39,989
Sale of hydrogen installations and other infrastructure
Revenue
Total estimated future revenue	30,317
Sales of electrolyzers
Revenue
Total estimated future revenue	320,839
Sale of oil and gas equipment
Revenue
Total estimated future revenue	11,186
Services performed on fuel cell systems and related infrastructure
Revenue
Total estimated future revenue	134,469
Power purchase agreements
Revenue
Total estimated future revenue	401,874
Fuel delivered to customers and related equipment
Revenue
Total estimated future revenue	91,984
Sales of cryogenic equipment and liquefiers
Revenue
Total estimated future revenue	$ 71,944
Maximum \| Sales of fuel cell systems
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	2 years
Maximum \| Sales of electrolyzers
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	2 years
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
Maximum \| Fuel delivered to customers and related equipment
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	10 years
Minimum \| Sales of fuel cell systems
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	1 year
Minimum \| Sale of hydrogen installations and other infrastructure
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	1 year
Minimum \| Sales of electrolyzers
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	1 year
Minimum \| Sale of oil and gas equipment
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	1 year
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
Minimum \| Fuel delivered to customers and related equipment
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	5 years
Minimum \| Sales of cryogenic equipment and liquefiers
Revenue
Duration of estimated revenue expected to be recognized in future (in years)	1 year