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Related-Party Debt - December 2024 Convertible Promissory Note (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 10, 2024 | Jun. 30, 2026 | Mar. 31, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025 | Dec. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Conversion of related-party convertible note into equity |  |  |  |  | $ 35,332 | $ 0 |  |
Reclassification of change in fair value related to instrument-specific credit risk |  | $ 0 |  | $ 0 | 1,425 | $ 0 |  |
Promissory Note | $505 Million Promissory Note, December 2023, Tranche 1 | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  | $ 125,000
Convertible Note | $505 Million Promissory Note, December 2023, Tranche 2 | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  | $ 380,000
Convertible Note | December 2024 Convertible Promissory Note | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Principal Amount |  | 480,000 |  |  | 480,000 |  | $ 505,000 |
Face amount | $ 505,000 | $ 480,000 |  |  | $ 480,000 |  |  |
Interest rate spread | 8.00% |  |  |  | 8.00% |  | 8.00% |
Conversion price (in dollars per share) | $ 5.4270 |  | $ 5.4270 |  |  |  |  |
Prepayment and accrued interest upon specified transaction | $ 50,000 |  |  |  |  |  |  |
Carrying value of debt |  |  | $ 25,000 |  |  |  |  |
Debt converted, shares issued (in shares) |  |  | 4,606,596 |  |  |  |  |
Conversion of related-party convertible note into equity |  |  | $ 35,300 |  |  |  |  |
Reclassification of change in fair value related to instrument-specific credit risk |  |  | $ 1,400 |  |  |  |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 + Details
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