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Stock-Based Compensation - Amazon Warrant Activities (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 14, 2021 | Apr. 16, 2021
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Contra revenue charge | $ 9,600,000 |  | $ 19,719,000 | $ 34,734,000 |  |
Fuel Sales |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Contra revenue charge | 6,500,000 | $ 17,400,000 | 14,000,000 | 34,700,000 |  |
Volume-related, O&M services |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Contra revenue charge | 3,100,000 |  | 5,700,000 |  |  |
Amazon Warrant |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Aggregate number of warrant shares (in shares) |  |  |  |  | 5,625,959 | 53,141,755
Purchase obligation for fuel |  |  |  |  |  | $ 500,000,000
Exercise price of the warrant (in dollars per share) |  |  |  |  | $ 13.49 | $ 13.49
Outstanding and unvested Beginning Balance |  |  | $ 21,157,323 |  |  |
Granted |  |  | 0 |  |  |
Vested |  |  | (2,350,816) |  |  |
Outstanding and unvested as of Ending Balance | 18,806,507 |  | $ 18,806,507 |  |  |
Number of warrants vested |  |  | 2,350,816 |  |  |
Contra revenue charge | 9,600,000 | $ 17,400,000 | $ 19,700,000 | $ 34,700,000 |  |
Amazon Warrant | Fuel Sales |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Contra revenue charge | 6,500,000 |  | 14,000,000 |  |  |
Amazon Warrant | Volume related fuel purchase |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Contra revenue charge | 9,600,000 |  | 19,700,000 |  |  |
Amazon Warrant | Volume-related, O&M services |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Contra revenue charge | $ 3,100,000 |  | $ 5,700,000 |  |  |

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