Revenue - Estimated future revenue (Details) $ in Thousands	6 Months Ended
Revenue - Estimated future revenue (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Revenue
Total estimated future revenue	$ 1,071,437
Sales of fuel cell systems
Revenue
Total estimated future revenue	65,210
Sale of hydrogen installations and other infrastructure
Revenue
Total estimated future revenue	19,311
Sale of electrolyzers
Revenue
Total estimated future revenue	224,301
Sales of engineered equipment
Revenue
Total estimated future revenue	19,210
Services performed on fuel cell systems and related infrastructure
Revenue
Total estimated future revenue	124,765
Power purchase agreements
Revenue
Total estimated future revenue	402,755
Fuel delivered to customers and related equipment
Revenue
Total estimated future revenue	95,184
Sales of cryogenic equipment and other
Revenue
Total estimated future revenue	$ 120,701
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