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Related Party Transactions
 9 Months Ended
Sep. 30, 2025
Related Party Transactions [Abstract]  
Related Party Transactions Related Party Transactions
Weichai Transactions
See Note 3. Weichai Transactions for information regarding the Weichai Shareholder’s Loan Agreement and Collaboration Agreement.
Other Related Party Transactions
See Note 10. Commitments and Contingencies for information regarding the Company’s indemnification obligations related to certain former directors and officers of the Company.
In January 2025, the Company entered into a five-year purchase agreement with SWIEC, for the exclusive purchase and distribution of certain engine and engine components for the fulfillment of a contract with a customer in North America. The supply agreement includes annual minimum requirements of products ordered during the initial term. If all minimum targets are met within the first three-year periods, the contract may be negotiated to extend beyond the five-year initial term. The annual minimum requirements are as follows:
(in thousands)
Year Ending December 31,
2025$19,023 
202649,937 
202749,937 
202895,117 
202995,117 
Total$309,131 
In February 2025, the Company entered into a MOR agreement with Weichai. The MOR agreement requires the Company to pay Weichai a fee of 1.75% of gross revenues generated by the sale of certain engines manufactured by Weichai. Fees are due on a quarterly basis. The MOR agreement further requires the 1.75% fee to be paid for applicable sales of these engines beginning January 2024. As of September 30, 2025, the Company had recorded an estimated liability of $0.1 million, recorded within Other accrued liabilities on the Consolidated Balance Sheets for the fee due to Weichai. The MOR agreement expires in December 2029.