Revenue - Estimated future revenue (Details) $ in Thousands	Jun. 30, 2026 USD ($)
Revenue
Estimated future revenue	$ 668,567
Sales of fuel cell systems
Revenue
Estimated future revenue	56,427
Sale of hydrogen installations and other infrastructure
Revenue
Estimated future revenue	57,084
Sales of electrolyzers
Revenue
Estimated future revenue	87,172
Sales of engineered equipment
Revenue
Estimated future revenue	74
Services performed on fuel cell systems and related infrastructure
Revenue
Estimated future revenue	136,957
Power purchase agreements
Revenue
Estimated future revenue	226,504
Fuel delivered to customers and related equipment
Revenue
Estimated future revenue	57,194
Sales of cryogenic equipment and other
Revenue
Estimated future revenue	45,792
Other
Revenue
Estimated future revenue	$ 1,363
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sales of fuel cell systems \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sales of fuel cell systems \| Maximum
Revenue
Estimated recognition period (years)	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| 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]: 2026-07-01 \| 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]: 2026-07-01 \| Sales of electrolyzers \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sales of electrolyzers \| Maximum
Revenue
Estimated recognition period (years)	3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sales of engineered equipment
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| 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]: 2026-07-01 \| 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]: 2026-07-01 \| Power purchase agreements \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Power purchase agreements \| Maximum
Revenue
Estimated recognition period (years)	10 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| 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]: 2026-07-01 \| 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]: 2026-07-01 \| Sales of cryogenic equipment and other
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Other \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Other \| Maximum
Revenue
Estimated recognition period (years)	2 years

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