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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | Note 14—Stock-Based Compensation The following table summarizes the compensation expense and related income tax benefit related to the Company’s stock-based compensation arrangements recognized in the accompanying condensed consolidated statements of operations during the three and nine months ended September 30, 2024 and 2025 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ |  | 2024 |  | 2025 |  | 2024 |  | 2025 |
Stock-based compensation expense, net of $0 tax in 2024 and 2025 | ​ | $ | 2,863 | ​ | $ | 2,193 | ​ | $ | 8,354 | ​ | $ | 6,373 | ​
​ As of September 30, 2025, there was $10.1 million of total unrecognized compensation costs related to unvested shares subject to outstanding service-based stock options and restricted stock units. Unrecognized compensation costs associated with these stock-based awards are expected to be expensed over a weighted-average period of approximately 1.7 years. As of September 30, 2025, total unrecognized compensation costs related to unvested shares subject to outstanding performance-based stock options were $3.9 million. As of September 30, 2025, total unrecognized compensation costs related to unvested shares subject to outstanding performance stock units were $1.0 million. Amazon Warrant On April 16, 2021, the Company entered into a Project Addendum to Fuel Pricing Agreement (the “Fuel Agreement”) with Amazon Logistics, Inc., a subsidiary of Amazon.com, Inc. (“Amazon”), and a Transaction Agreement with Amazon (the “Transaction Agreement”), pursuant to which, among other things, the Company issued to Amazon.com NV Investment Holdings LLC, a subsidiary of Amazon (“Amazon Holdings”), a warrant to purchase up to an aggregate of 53,141,755 shares (the “Warrant Shares”) of the Company’s common stock at an exercise price of $13.49 per share. As a result of the issuance of additional shares of common stock under the Company’s at-the-market offering programs in 2021 and in accordance with the terms of the warrant, on June 14, 2021, the number of shares of the Company’s common stock that may be purchased pursuant to the warrant, at an exercise price of $13.49 per share, increased by an aggregate of 5,625,959 shares (the “Additional Warrant Shares”). The Warrant Shares and the Additional Warrant Shares shall vest in multiple tranches, certain of which vested immediately upon execution of the Fuel Agreement. Subsequent tranches will vest over time based on fuel purchases by Amazon and its affiliates, up to a total of $500.0 million, excluding any payments attributable to “Pass Through Costs,” which consist of all costs associated with the delivered cost of gas and applicable taxes determined by reference to the selling price of gallons of gas sold. The right to exercise the warrants and to receive the Warrant Shares and Additional Warrant Shares (the “Amazon Warrant”) that have vested expires on April 16, 2031. Non-cash stock-based sales incentive contra-revenue charges (“Amazon Warrant Charges”) associated with the Amazon Warrant are recognized as Amazon and its affiliates purchase fuel and vesting conditions become probable of being achieved, based on the grant date fair value of the Amazon Warrant. The following table summarizes the Amazon Warrant activities for the nine months ended September 30, 2025: ​
​ | ​ | ​
​ | ​ | Warrant
​ |  | Shares
Outstanding and unvested as of December 31, 2024 |  | 29,972,883
Granted |  | —
Vested |  | (7,052,448)
Outstanding and unvested as of September 30, 2025 |  | 22,920,435
​ 7,052,448 shares of the Amazon Warrant vested in the nine months ended September 30, 2025 based on fuel purchases made by Amazon and its affiliates. The Company recognized Amazon Warrant Charges of $15.8 million and $16.8 million in the three months ended September 30, 2024 and 2025, respectively, and $42.7 million and $51.5 million in the nine months ended September 30, 2024 and 2025, respectively, relating to customer fuel purchases.

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