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Simple Agreements for Future Equity - Additional information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Apr. 30, 2025
Simple Agreements For Future Equity [Line Items] |  |  |  |  |  |
Percentage of Discount Price Per Share |  |  |  | 50.00% |  |
Simple Agreements For Future Equity Price Per Share Valuation Cap |  |  |  | $ 500,000 |  |
Debt Instrument Value Exchanged For Equity |  |  |  |  |  | $ 10,000
Conversion of Stock, Shares Converted | 30,061,262 |  |  |  |  |
Conversion of Stock, Amount Converted | $ 263,000 | $ 170,648 | $ 0 |  |  |
Simple Agreement For Future Equity [Member] |  |  |  |  |  |
Simple Agreements For Future Equity [Line Items] |  |  |  |  |  |
Stock Issued During Period, Value, Other |  | 23,700 |  |  |  |
AACT Affiliate [Member] | Simple Agreement For Future Equity [Member] |  |  |  |  |  |
Simple Agreements For Future Equity [Line Items] |  |  |  |  |  |
Stock Issued During Period, Value, Other |  | 10,000 |  |  |  |
Affiliates of Board [Member] | Simple Agreement For Future Equity [Member] |  |  |  |  |  |
Simple Agreements For Future Equity [Line Items] |  |  |  |  |  |
Stock Issued During Period, Value, Other |  | $ 4,000 |  |  |  |
2023 SAFE [Member] |  |  |  |  |  |
Simple Agreements For Future Equity [Line Items] |  |  |  |  |  |
Payments for Repurchase of Equity |  |  |  |  | $ 10,000 |
Percentage of Discount Price Per Share |  |  |  |  | 75.00% |
Simple Agreements For Future Equity Price Per Share Valuation Cap |  |  |  |  | $ 800,000 |
2024 SAFE [Member] |  |  |  |  |  |
Simple Agreements For Future Equity [Line Items] |  |  |  |  |  |
Payments for Repurchase of Equity |  |  |  | $ 45,200 |  |
Percentage of Discount Price Per Share |  |  |  | 50.00% |  |
Simple Agreements For Future Equity Price Per Share Valuation Cap |  |  |  | $ 500,000 |  |
2024 SAFE [Member] | Board [Member] |  |  |  |  |  |
Simple Agreements For Future Equity [Line Items] |  |  |  |  |  |
Payments for Repurchase of Equity |  |  |  | $ 10,400 |  |

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- Definition The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
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