Intangible Assets and Goodwill - Gross Carrying Amount (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Gross Carrying Amount	$ 236,714	$ 235,742
Accumulated Amortization	(32,974)	(28,017)
Total	$ 203,740	$ 207,725
Acquired technology
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted Average Amortization Period	14 years	14 years
Gross Carrying Amount	$ 104,389	$ 104,221
Accumulated Amortization	(14,746)	(12,754)
Total	$ 89,643	$ 91,467
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	$ 29,000	$ 29,000
Accumulated Amortization	(3,142)	(2,417)
Total	$ 25,858	$ 26,583
Customer relationships, Non-compete agreements, Backlog & Trademark
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets
Weighted Average Amortization Period	12 years	13 years
Gross Carrying Amount	$ 103,325	$ 102,521
Accumulated Amortization	(15,086)	(12,846)
Total	$ 88,239	$ 89,675