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Fair Value Measurements (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2025 | Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Schedule of company's financial assets and liabilities measured at fair value | The following tables summarize the Company’s financial assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):
|  | September 30, 2025 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PIPE Warrants |  | $ | — |  |  | $ | — |  |  | $ | 86,359 |  |  | $ | 86,359 |
NRA Warrants |  |  | — |  |  |  | — |  |  |  | 36,968 |  |  |  | 36,968 |
Second lien loan |  |  | — |  |  |  | — |  |  |  | 10,423 |  |  |  | 10,423 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 133,750 |  |  | $ | 133,750 |
|  | December 31, 2024 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 9,439 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,439 |
Total assets measured at fair value |  | $ | 9,439 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,439 |
|  | December 31, 2024 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SAFEs |  | $ | — |  |  | $ | — |  |  | $ | 59,301 |  |  | $ | 59,301 |
Redeemable convertible preferred stock warrant liabilities |  |  | — |  |  |  | — |  |  |  | 1,619 |  |  |  | 1,619 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 60,920 |  |  | $ | 60,920 |
| The following tables summarize the Company’s financial assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):
|  | December 31, 2024 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |
Money market funds |  | $ | 9,439 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,439 |
Total assets measured at fair value |  | $ | 9,439 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,439 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SAFEs |  | $ | — |  |  | $ | — |  |  | $ | 59,301 |  |  | $ | 59,301 |
Redeemable convertible preferred stock warrant liabilities |  |  | — |  |  |  | — |  |  |  | 1,619 |  |  |  | 1,619 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 60,920 |  |  | $ | 60,920 |
|  | December 31, 2023 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |
Money market funds |  | $ | 7,042 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,042 |
U.S. treasury securities |  |  | 5,055 |  |  |  | — |  |  |  | — |  |  |  | 5,055 |
Total assets measured at fair value |  | $ | 12,097 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,097 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SAFE |  | $ | — |  |  | $ | — |  |  | $ | 10,000 |  |  | $ | 10,000 |
Redeemable convertible preferred stock warrant liabilities |  |  | — |  |  |  | — |  |  |  | 2,045 |  |  |  | 2,045 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 12,045 |  |  | $ | 12,045 |
Schedule of changes in the estimated fair values | The following table summarizes changes in the estimated fair values of these liabilities (in thousands):
|  | Second Lien Loans |  |  | SAFE |  |  | Legacy Kodiak Redeemable Convertible Preferred Stock Warrants |
Balance as of December 31, 2024 |  | $ | — |  |  | $ | 59,301 |  |  | $ | 1,619 |
Issuance of second lien loans |  |  | 43,865 |  |  |  | — |  |  |  | — |
Issuance of SAFEs |  |  | — |  |  |  | 23,660 |  |  |  | — |
Exchange of SAFE for second lien loan |  |  | 10,000 |  |  |  | (10,000 | ) |  |  | — |
Reclassification of Assumed Kodiak Warrants |  |  | — |  |  |  | — |  |  |  | (3,842 | )
Fair value remeasurement |  |  | 23,938 |  |  |  | 190,075 |  |  |  | 7,272 |
Settlement via conversion or exercise |  |  | (67,380 | ) |  |  | (263,036 | ) |  |  | (5,049 | )
Balance as of September 30, 2025 |  | $ | 10,423 |  |  | $ | — |  |  | $ | — |
Balance as of December 31, 2023 |  | $ | — |  |  | $ | 10,000 |  |  | $ | 2,045 |
Issuance of SAFEs |  |  | — |  |  |  | 44,054 |  |  |  | — |
Fair value remeasurement |  |  | — |  |  |  | — |  |  |  | (321 | )
Balance as of September 30, 2024 |  | $ | — |  |  | $ | 54,054 |  |  | $ | 1,724 |
| The following table summarizes changes in the estimated fair values of these liabilities (in thousands):
|  | SAFE |  |  | Redeemable Convertible Preferred Stock Warrants |  |  | Total |
Balance as of December 31, 2022 |  | $ | — |  |  | $ | 1,451 |  |  | $ | 1,451 |
Issuance of SAFE |  |  | 10,000 |  |  |  | — |  |  |  | 10,000 |
Correction of an immaterial error of redeemable convertible preferred stock warrants |  |  | — |  |  |  | 720 |  |  |  | 720 |
Fair value remeasurement |  |  | — |  |  |  | (126 | ) |  |  | (126 | )
Balance as of December 31, 2023 |  |  | 10,000 |  |  |  | 2,045 |  |  |  | 12,045 |
Issuance of SAFEs |  |  | 45,192 |  |  |  | — |  |  |  | 45,192 |
Fair value remeasurement |  |  | 4,109 |  |  |  | (426 | ) |  |  | 3,683 |
Balance as of December 31, 2024 |  | $ | 59,301 |  |  | $ | 1,619 |  |  | $ | 60,920 |
Simple Agreements For Future Equity [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Schedule of determined the fair value of its SAFE obligations |  | The Company determined the fair value of its SAFE obligations by using a valuation model with key assumptions summarized in the table below. The Company utilized a probability-weighted model that used both the pay-off method and Black-Scholes option-pricing model based on the potential settlement outcomes of the SAFE obligations, including a liquidity event, next equity financing and dissolution, as these events became known or knowable as of the valuation date.
|  | Year Ended December 31, |
|  | 2024 |  |  | 2023 |
Expected term to underlying triggering events (in years) |  |  | 0.7 |  |  |  | 0.4 – 3.0 |
Discount rate |  |  | 20.9 | % |  |  | 26.0 | %
Volatility |  |  | 60.7 | % |  |  | 49.9 – 102.3 | %
Redeemable Convertible Preferred Stock Warrants [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Schedule of determined the fair value of its SAFE obligations |  | The Company determined the fair value of its redeemable convertible preferred stock warrants by using a Black-Scholes option-pricing model with key assumptions summarized in the table below. The Company utilized a probability-weighted Black-Scholes option-pricing model based on the potential settlement outcomes of the redeemable convertible preferred stock warrants, including a liquidity event or future equity financing as well as other settlement alternatives, as these events became known or knowable as of the valuation date.
|  | Year Ended December 31, |
|  | 2024 |  |  | 2023 |
Exercise price |  | $ | 0.001 – $2.34 |  |  | $ | 0.001 – $2.34 |
Expected term (in years) |  |  | 3.6 – 7.7 |  |  |  | 4.6 – 8.7 |
Risk-free interest rate |  |  | 4.3% – 4.5% |  |  |  | 3.8% – 3.9% |
Volatility |  |  | 80.3% |  |  |  | 83.1% |
Dividend yield |  |  | — |  |  |  | — |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: 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 2: 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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