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Fair Value Measurements - Summary of Information About Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Aug. 14, 2025 | Feb. 06, 2025 | Dec. 31, 2024
--- | --- | --- | --- | ---
Liabilities: |  |  |  |
Earn-out Liability |  |  |  | $ 45,900
Fair Value, Inputs, Level 1 |  |  |  |
Assets: |  |  |  |
Assets | $ 20,884 |  |  | 29,806
Liabilities: |  |  |  |
Derivative liabilities | 214,316 |  |  | 70,265
Fair Value, Inputs, Level 1 | Money market funds |  |  |  |
Assets: |  |  |  |
Cash equivalents | 20,884 |  |  | 29,806
Fair Value, Inputs, Level 2 |  |  |  |
Assets: |  |  |  |
Assets | 532,805 |  |  | 174,323
Fair Value, Inputs, Level 2 | U.S. treasury securities |  |  |  |
Assets: |  |  |  |
Cash equivalents |  |  |  | 24,835
Fair Value, Inputs, Level 2 | US treasury securities, short term |  |  |  |
Assets: |  |  |  |
Assets | 420,850 |  |  | 124,420
Fair Value, Inputs, Level 2 | US treasury securities, long term |  |  |  |
Assets: |  |  |  |
Assets | 111,955 |  |  | 25,068
Fair Value, Inputs, Level 3 |  |  |  |
Liabilities: |  |  |  |
Derivative liabilities | 26,421 |  |  | 68,727
Fair Value, Inputs, Level 3 | Earn-out liabilities |  |  |  |
Liabilities: |  |  |  |
Earn-out Liability |  |  |  | 45,897
Sponsor Redemption Based Vesting Shares |  |  |  |
Liabilities: |  |  |  |
Earn-out Liability |  | $ 10,400 |  |
Promote Sponsor Vesting Shares |  |  |  |
Liabilities: |  |  |  |
Earn-out Liability |  |  | $ 32,900 |
Public Warrants | Fair Value, Inputs, Level 1 | Derivative |  |  |  |
Liabilities: |  |  |  |
Derivative liabilities | 214,316 |  |  | 70,265
Private Warrants | Fair Value, Inputs, Level 3 | Derivative |  |  |  |
Liabilities: |  |  |  |
Derivative liabilities | $ 26,421 |  |  | $ 22,830

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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