Revenue - Estimated future revenue (Details) $ in Thousands	Mar. 31, 2026 USD ($)
Revenue
Estimated future revenue	$ 737,698
Sales of fuel cell systems
Revenue
Estimated future revenue	73,413
Sale of hydrogen installations and other infrastructure
Revenue
Estimated future revenue	53,269
Sales of electrolyzers
Revenue
Estimated future revenue	95,312
Sales of engineered equipment
Revenue
Estimated future revenue	744
Services performed on fuel cell systems and related infrastructure
Revenue
Estimated future revenue	146,917
Power purchase agreements
Revenue
Estimated future revenue	250,267
Fuel delivered to customers and related equipment
Revenue
Estimated future revenue	60,596
Sales of cryogenic equipment and other
Revenue
Estimated future revenue	56,534
Other
Revenue
Estimated future revenue	$ 646
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Sales of fuel cell systems \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Sales of fuel cell systems \| Maximum
Revenue
Estimated recognition period (years)	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Sale of hydrogen installations and other infrastructure \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Sale of hydrogen installations and other infrastructure \| Maximum
Revenue
Estimated recognition period (years)	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Sales of electrolyzers \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Sales of electrolyzers \| Maximum
Revenue
Estimated recognition period (years)	3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Sales of engineered equipment
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Services performed on fuel cell systems and related infrastructure \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Services performed on fuel cell systems and related infrastructure \| Maximum
Revenue
Estimated recognition period (years)	10 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Power purchase agreements \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Power purchase agreements \| Maximum
Revenue
Estimated recognition period (years)	10 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Fuel delivered to customers and related equipment \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Fuel delivered to customers and related equipment \| Maximum
Revenue
Estimated recognition period (years)	10 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Sales of cryogenic equipment and other
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 \| Other
Revenue
Estimated recognition period (years)	1 year

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