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v3.25.3

Overview and Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Apr. 30, 2025 USD ($) shares | Mar. 31, 2025 USD ($) $ / shares shares | Sep. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) $ / shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) segment | Sep. 30, 2024 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Payments of stock issuance costs |  |  |  |  |  |  | $ 28,769 | $ 0
Compensation expense |  |  | $ 144,431 |  |  | $ 7,617 | 473,409 | 23,466
Tax withholdings on settlement of shares |  |  | 11,485 | $ 92,541 | $ 15,685 |  |  |
Conversion ratio |  | 20 |  |  |  |  |  |
Research and development expense |  |  | 93,000 |  |  | $ 14,000 | $ 243,000 | $ 35,000
Number of operating segments | segment |  |  |  |  |  |  | 1 |
Number of reportable segments | segment |  |  |  |  |  |  | 1 |
Line of Credit | DDTL 2.0 Facility |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Restricted cash, current | $ 500,000 | $ 500,000 |  |  | $ 500,000 |  |  |
IPO |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Compensation expense |  | 177,000 |  |  |  |  |  |
Capitalized costs |  | $ 17,000 |  |  |  |  |  |
Tax withholdings on settlement of restricted stock units (in shares) | shares |  | 392,135 |  |  |  |  |  |
Shares issued (in shares) | shares |  | 518,785 |  |  |  |  |  |
Restricted cash, current |  |  | 500,000 |  |  |  | $ 500,000 |
Deferred offering costs |  |  | $ 31,000 |  |  |  | $ 31,000 |
Common Class A | IPO |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Shares issued in transaction (in shares) | shares |  | 36,590,000 |  |  |  |  |  |
Sale of stock price (usd per share) | $ / shares |  | $ 40.00 |  |  | $ 40.00 |  |  |
Proceeds from sale of stock |  | $ 1,400,000 |  |  |  |  |  |
Payments of stock issuance costs |  | $ 31,000 |  |  |  |  |  |
Conversion of stock, shares issued (in shares) | shares |  | 155,111,700 |  |  |  |  |  |
Tax withholdings on settlement of shares |  | $ 16,000 |  |  |  |  |  |
Common Class A | Over-Allotment Option |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Shares issued in transaction (in shares) | shares | 1,760,000 |  |  |  |  |  |  |
Proceeds from sale of stock | $ 68,000 |  |  |  |  |  |  |
Redeemable Class A Common Stock | IPO |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Conversion of stock, shares issued (in shares) | shares |  | 29,874,066 |  |  |  |  |  |

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