Intangible Assets and Goodwill - Gross Carrying Amount (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 22, 2021
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Gross Carrying Amount	$ 165,027	$ 43,587
Accumulated Amortization	(6,819)	(4,336)
Total	158,208	39,251
Goodwill	220,436	72,387
Increase in goodwill	148,500
Translation loss on goodwill	500
Goodwill impairments	0	0	$ 0
EnergyOr
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Acquired			1,500
Milestone payments			$ 3,000
American Fuel Cell LLC
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Milestone payments		2,900
Protium
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Acquired	$ 928
Applied Cryo Technologies
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted Average Amortization Period	5 years
Acquired				$ 70,484
Goodwill				93,251
In process R&D
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Gross Carrying Amount	$ 29,000	29,000
Total	$ 29,000	$ 29,000
Acquired Technology
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted Average Amortization Period	13 years	10 years
Gross Carrying Amount	$ 45,530	$ 13,697
Accumulated Amortization	(5,392)	(4,042)
Total	$ 40,138	$ 9,655
Customer Relationships | Applied Cryo Technologies
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Acquired				$ 26,600
Customer relationships, Backlog & Trademark
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted Average Amortization Period	12 years	6 years
Gross Carrying Amount	$ 90,497	$ 890
Accumulated Amortization	(1,427)	(294)
Total	$ 89,070	$ 596