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Partnerships | 12 Months Ended
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Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Partnerships | Note 5. Partnerships In December 2020, the Company established a partnership with Hyundai Motor Company (“Hyundai”) when it entered into a joint development agreement (“JDA”) to jointly research and develop Li-Metal battery technology, which concluded in November 2023. Further, in May 2021, the Company executed another JDA with Hyundai to jointly develop the A-Sample Li-Metal batteries effective August 31, 2021. In March 2024, the Company extended this JDA until December 2025 to develop the B-sample Li-Metal batteries. The JDA concluded in December 2025. In February 2021, the Company established a partnership with GM Global Technology Operations LLC (“GM Technology”), an affiliate of GM Ventures LLC (“GM Ventures”), and General Motors Holdings LLC (“GM Holdings”) (collectively, “General Motors” or “GM”) when it entered into a JDA to jointly research and develop the A-Sample Li-Metal batteries and build-out a prototype manufacturing line for GM Technology. The JDA concluded in September 2024. In December 2021, the Company established a partnership with Honda Motor Company, Ltd. (“Honda”) when it entered into a JDA to jointly research and develop the A-Sample Li-Metal batteries, which concluded in June 2023. The Company entered into a B-sample services agreement with Honda to replace the JDA in January 2025, with a term through June 2026. The JDA concluded in December 2025. In November 2023, the Company entered into a B-Sample JDA with one of our OEM partners for delivery of the B-Sample batteries. The JDA had a term of two and half years. The JDA concluded in December 2025. Under the terms of certain JDAs, the Company funded research and development activities and capital expenditures related to the buildout of pilot manufacturing lines and the JDA partner was required to refund such expenses to the Company, regardless of the results of the R&D activities. The following table summarizes credits to research and development recorded in accordance with the terms of the JDA agreements: ​
​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended December 31,
(in thousands) | 2025 | ​ ​ ​ | 2024
Research and development (related party) | $ | — | ​ | $ | 3,190
Research and development | ​ | — | ​ | ​ | 5,385
Total credits to research and development | $ | — | ​ | $ | 8,575

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