Revenue - Estimated future revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Revenue
Total estimated future revenue	$ 682,149
Sales of fuel cell systems
Revenue
Total estimated future revenue	16,466
Sale of hydrogen installations and other infrastructure
Revenue
Total estimated future revenue	40,487
Sale of electrolyzers
Revenue
Total estimated future revenue	51,267
Sale of oil and gas equipment
Revenue
Total estimated future revenue	73,270
Services performed on fuel cell systems and related infrastructure
Revenue
Total estimated future revenue	98,635
Power purchase agreements
Revenue
Total estimated future revenue	255,929
Fuel delivered to customers and related equipment
Revenue
Total estimated future revenue	83,796
Sale of cryogenic equipment
Revenue
Total estimated future revenue	$ 62,299
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)	7 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