Revenue - Estimated future revenue (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Revenue
Total estimated future revenue	$ 931,742
Sales of fuel cell systems
Revenue
Total estimated future revenue	26,551
Sale of hydrogen installations and other infrastructure
Revenue
Total estimated future revenue	28,492
Sale of electrolyzers
Revenue
Total estimated future revenue	266,738
Sales of engineered equipment
Revenue
Total estimated future revenue	26,859
Services performed on fuel cell systems and related infrastructure
Revenue
Total estimated future revenue	121,761
Power purchase agreements
Revenue
Total estimated future revenue	319,742
Fuel delivered to customers and related equipment
Revenue
Total estimated future revenue	90,925
Sale of cryogenic equipment
Revenue
Total estimated future revenue	$ 50,674
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