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Investments (Tables)
 12 Months Ended
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 CostGross Unrealized GainsGross Unrealized LossesEstimated Fair ValueAccrued 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 CostGross Unrealized GainsGross Unrealized LossesEstimated Fair ValueAccrued Interest
Short-term:
US Treasury bills and notes$20,423 $6 $— $20,429 $14 
Corporate debt securities21,736 14 (33)21,717 209 
Yankee debt securities3,000 — (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,
20242023
Equity Method Investment in LanzaJet$4,363 $7,066 
Equity Security Investment in SGLT14,990 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,
20242023
Selected Statement of Operations Information(1):
Revenues$13,477 $4,542 
Gross profit5,209 2,526 
Net loss(43,743)(14,881)
Net loss attributable to the Company$(14,775)$(3,432)
Years Ended December 31,
20242023
Selected Balance Sheet Information(2):
Current assets$79,060 $79,843 
Non-current assets271,019 185,720 
Current liabilities(29,069)44,145 
Non-current liabilities$(303,352)$175,899 
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(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.