Restricted Cash	6 Months Ended
Jun. 30, 2026
Restricted Cash and Cash Equivalent [Abstract]
Restricted Cash	7. Restricted Cash On February 6, 2026, as a result of the redemption of the Remarketed Bonds and the Series 2025A Bonds with the proceeds from the OIC Term Loan Amendment, the Company’s restricted cash balances of $35.8 million were released. The restricted cash that was released consisted of $28.8 million held as collateral for a letter of credit to provide financing support for the Company’s Remarketed Bonds, (the “Bond Letter of Credit”), which supported the development and construction of NW Iowa RNG, and reserve accounts totaling $7.0 million for debt service reserves and an operating and maintenance reserves related to the Series 2025A Bonds. See Note 17, Debt, for additional information on the Remarketed Bonds, the Series 2025A Bonds and OIC Term Loan Amendment. The Company recorded interest income on the restricted cash balances of $0.1 million during the six months ended June 30, 2026, and $0.7 million and $1.4 million during the three and six months ended June 30, 2025, respectively. The interest income is included in Interest and investment income in the Condensed Consolidated Statements of Operations.

Restricted Cash

6 Months Ended

Jun. 30, 2026

Restricted Cash and Cash Equivalent [Abstract]

7. Restricted Cash

On February 6, 2026, as a result of the redemption of the Remarketed Bonds and the Series 2025A Bonds with the proceeds from the OIC Term Loan Amendment, the Company’s restricted cash balances of $35.8 million were released. The restricted cash that was released consisted of $28.8 million held as collateral for a letter of credit to provide financing support for the Company’s Remarketed Bonds, (the “Bond Letter of Credit”), which supported the development and construction of NW Iowa RNG, and reserve accounts totaling $7.0 million for debt service reserves and an operating and maintenance reserves related to the Series 2025A Bonds. See Note 17, Debt, for additional information on the Remarketed Bonds, the Series 2025A Bonds and OIC Term Loan Amendment.

The Company recorded interest income on the restricted cash balances of $0.1 million during the six months ended June 30, 2026, and $0.7 million and $1.4 million during the three and six months ended June 30, 2025, respectively. The interest income is included in Interest and investment income in the Condensed Consolidated Statements of Operations.