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Summary of Significant Accounting Policies - Schedule of Deferred Revenue (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Deferred Revenue Arrangement [Line Items] |  |  |
Deferred revenue | $ 1,481,181 | $ 1,338,347 | $ 1,200,000
Under Customer Agreements: |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Deferred revenue | 1,113,435 | 1,029,956 |
Under Customer Agreements: | Payments received, net |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Deferred revenue | 1,028,064 | 950,225 |
Under Customer Agreements: | Financing component balance |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Deferred revenue | 85,371 | 79,731 |
Under SREC contracts: |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Deferred revenue | 367,746 | 308,391 |
Under SREC contracts: | Payments received, net |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Deferred revenue | 348,101 | 291,972 |
Under SREC contracts: | Financing component balance |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Deferred revenue | $ 19,645 | $ 16,419 |

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