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Investments (Tables)
 6 Months Ended
Jun. 30, 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.
June 30, 2024
(in thousands)
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Accrued Interest
Short-term
Corporate debt securities
$12,890 $2 $(5)$12,887 $146 
Total debt securities due within a year
$12,890 $2 $(5)$12,887 $146 
Total HTM Debt Securities
$12,890 $2 $(5)$12,887 $146 

December 31, 2023
(in thousands)
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated 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 securities3,000 — (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 
Schedule of Investments
The Company’s equity investments consisted of the following (in thousands):
As of
June 30, 2024December 31, 2023
Equity Method Investment in LanzaJet$16,592 $7,066 
Equity Security Investment in SGLT14,990 14,990 
Total Investment
$31,582 $22,056