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Intangible Assets and Goodwill - Gross Carrying Amount (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets    
Gross Carrying Amount $ 236,041 $ 235,742
Accumulated Amortization (47,155) (28,017)
Total 188,886 $ 207,725
Impairment of goodwill $ 249,480  
Acquired technology    
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets    
Weighted Average Amortization Period 14 years 14 years
Gross Carrying Amount $ 103,060 $ 104,221
Accumulated Amortization (20,204) (12,754)
Total $ 82,856 $ 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 (5,317) (2,417)
Total $ 23,683 $ 26,583
Customer relationships trade name and other    
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets    
Weighted Average Amortization Period 13 years 13 years
Gross Carrying Amount $ 103,981 $ 102,521
Accumulated Amortization (21,634) (12,846)
Total $ 82,347 $ 89,675