Intangible Assets - Gross Carrying Amount (Details) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Intangible Assets | ||
| Gross Carrying Amount | $ 34,662 | $ 34,795 |
| Accumulated Amortization | (8,303) | (5,567) |
| Total | $ 26,359 | $ 29,228 |
| Acquired technology | ||
| Intangible Assets | ||
| Weighted Average Amortization Period | 11 years | 11 years |
| Gross Carrying Amount | $ 15,992 | $ 15,997 |
| Accumulated Amortization | (4,224) | (3,047) |
| Total | $ 11,768 | $ 12,950 |
| Dry stack electrolyzer technology | ||
| Intangible Assets | ||
| Weighted Average Amortization Period | 10 years | 10 years |
| Gross Carrying Amount | $ 11,351 | $ 11,352 |
| Accumulated Amortization | (3,061) | (1,913) |
| Total | $ 8,290 | $ 9,439 |
| Customer relationships, trade name, and other | ||
| Intangible Assets | ||
| Weighted Average Amortization Period | 14 years | 14 years |
| Gross Carrying Amount | $ 7,319 | $ 7,446 |
| Accumulated Amortization | (1,018) | (607) |
| Total | $ 6,301 | $ 6,839 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Useful life of finite-lived intangible asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of accumulated amortization of finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, before accumulated amortization, of finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, after accumulated amortization, of finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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