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Investments (Tables) | 12 Months Ended
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Dec. 31, 2024
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of Debt Securities, Held-To-Maturity | HTM debt securities are classified as short-term or long-term based upon the contractual maturity of the underlying investment.
| December 31, 2024
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Accrued Interest
Short-term: |  |  |  |  |  |  |  |  |
Corporate debt securities | $ | 12,374 |  |  | $ | 3 |  |  | $ | (6) |  |  | $ | 12,371 |  |  | $ | 83 |
Total HTM Debt Securities | $ | 12,374 |  |  | $ | 3 |  |  | $ | (6) |  |  | $ | 12,371 |  |  | $ | 83 |
| December 31, 2023
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Accrued Interest
Short-term: |  |  |  |  |  |  |  |  |
US Treasury bills and notes | $ | 20,423 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 20,429 |  |  | $ | 14 |
Corporate debt securities | 21,736 |  |  | 14 |  |  | (33) |  |  | 21,717 |  |  | 209 |
Yankee debt securities | 3,000 |  |  | — |  |  | (8) |  |  | 2,992 |  |  | 43 |
Total HTM Debt Securities | $ | 45,159 |  |  | $ | 20 |  |  | $ | (41) |  |  | $ | 45,138 |  |  | $ | 266 |
Schedule of Investments | The Company’s equity investments consisted of the following (in thousands):
|  | December 31,
|  | 2024 |  | 2023
Equity Method Investment in LanzaJet |  | $ | 4,363 |  |  | $ | 7,066 |
Equity Security Investment in SGLT |  | 14,990 |  |  | 14,990 |
Total Investment |  | $ | 19,353 |  |  | $ | 22,056 |
The following table presents summarized aggregated financial information of our equity method investment:
| Years Ended December 31,
| 2024 |  | 2023
Selected Statement of Operations Information(1): |  |  |
Revenues | $ | 13,477 |  |  | $ | 4,542 |
Gross profit | 5,209 |  |  | 2,526 |
Net loss | (43,743) |  |  | (14,881) |
Net loss attributable to the Company | $ | (14,775) |  |  | $ | (3,432) |
| Years Ended December 31,
| 2024 |  | 2023
Selected Balance Sheet Information(2): |  |  |
Current assets | $ | 79,060 |  |  | $ | 79,843 |
Non-current assets | 271,019 |  |  | 185,720 |
Current liabilities | (29,069) |  |  | 44,145 |
Non-current liabilities | $ | (303,352) |  |  | $ | 175,899 |
__________________ (1)The income statement amounts reflect LanzaJet’s activity for the years ended December 31, 2024 and 2023. (2)The balance sheet information reflects LanzaJet as of December 31, 2024 and 2023.

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