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Intangible Assets and Goodwill - Gross Carrying Amount (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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