Intangible Assets and Goodwill - Gross Carrying Amount (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Gross Carrying Amount	$ 103,212	$ 236,041
Accumulated Amortization	(18,552)	(47,155)
Total	84,660	188,886
Goodwill	$ 0	0
Impairment of goodwill		$ 249,500
Acquired technology
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted Average Amortization Period	14 years	14 years
Gross Carrying Amount	$ 34,872	$ 103,060
Accumulated Amortization	(7,805)	(20,204)
Total	$ 27,067	$ 82,856
Dry stack electrolyzer technology
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted Average Amortization Period	10 years	10 years
Gross Carrying Amount	$ 11,351	$ 29,000
Accumulated Amortization	(383)	(5,317)
Total	$ 10,968	$ 23,683
Customer relationships, trade name, and other
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted Average Amortization Period	15 years	13 years
Gross Carrying Amount	$ 56,989	$ 103,981
Accumulated Amortization	(10,364)	(21,634)
Total	$ 46,625	$ 82,347