Intangible Assets and Goodwill - Gross Carrying Amount (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Gross Carrying Amount	$ 235,742	$ 165,027
Accumulated Amortization	(28,017)	(6,819)
Total	207,725	158,208
Increase in goodwill	26,100
Goodwill impairments	$ 0	0	$ 0
In process research and development
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Gross Carrying Amount		29,000
Total		$ 29,000
Acquired technology
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted average amortization period	14 years	13 years
Gross Carrying Amount	$ 104,221	$ 45,530
Accumulated Amortization	(12,754)	(5,392)
Total	$ 91,467	$ 40,138
Dry stack electrolyzer technology
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted average amortization period	10 years
Gross Carrying Amount	$ 29,000
Accumulated Amortization	(2,417)
Total	$ 26,583
Customer relationships, Non-compete agreements, Backlog & Trademark
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted average amortization period	13 years	12 years
Gross Carrying Amount	$ 102,521	$ 90,497
Accumulated Amortization	(12,846)	(1,427)
Total	$ 89,675	$ 89,070