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Investments (Tables) | 3 Months Ended
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Mar. 31, 2024
Equity Method Investments and Joint Ventures [Abstract] |
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.
| March 31, 2024
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Accrued Interest
Short-term |  |  |  |  |  |  |  |  |
US Treasury bills and notes | 10,661 |  |  | 0 |  | $ | (1) |  |  | $ | 10,660 |  |  | $ | 45 |
Corporate debt securities | 21,158 |  |  | 4 |  |  | (25) |  |  | 21,137 |  |  | 311 |
Yankee debt securities | 3,000 |  |  | — |  |  | — |  |  | 3,000 |  |  | 87 |
Total debt securities due within a year | $ | 34,819 |  |  | $ | 4 |  |  | $ | (26) |  |  | $ | 34,797 |  |  | $ | 443 |
Total HTM Debt Securities | 34,819 |  |  | 4 |  |  | (26) |  |  | 34,797 |  |  | 443 |
| 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 debt securities due within a year | $ | 45,159 |  |  | $ | 20 |  |  | $ | (41) |  |  | $ | 45,138 |  |  | $ | 266 |
Total HTM Debt Securities | 45,159 |  |  | 20 |  |  | (41) |  |  | 45,138 |  |  | 266 |
Investments | The Company’s equity investments consisted of the following (in thousands):
|  | As of
|  | March 31, 2024 |  | December 31, 2023
Equity Method Investment in LanzaJet |  | $ | 6,354 |  |  | $ | 7,066 |
Equity Security Investment in SGLT |  | 14,990 |  |  | 14,990 |
Total Investment |  | $ | 21,344 |  |  | $ | 22,056 |

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