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Stockholders' Deficit - Schedule Of Common Stock Reserved For Future Issuance (Details) - shares | Sep. 30, 2025 | Dec. 31, 2024
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Common Stock Reserved For Future Issuance [Line Items] |  |  |
Common stock | 250,523,000 |  | 173,751
Redeemable Convertible Preferred Stock [Member] |  |  |
Common Stock Reserved For Future Issuance [Line Items] |  |  |
Common stock |  |  | 93,963,000
Outstanding stock options [Member] |  |  |
Common Stock Reserved For Future Issuance [Line Items] |  |  |
Common stock | 55,990,000 |  | 74,211,000
Shares available for issuance under equity incentive plan [Member] |  |  |
Common Stock Reserved For Future Issuance [Line Items] |  |  |
Common stock | 28,195,000 |  | 2,175,000
Redeemable convertible preferred stock warrants [Member] |  |  |
Common Stock Reserved For Future Issuance [Line Items] |  |  |
Common stock |  |  | 1,969,000
Common stock warrants [Member] |  |  |
Common Stock Reserved For Future Issuance [Line Items] |  |  |
Common stock | 65,235,000 | [1] | 1,433
Earn Out Securities [Member] |  |  |
Common Stock Reserved For Future Issuance [Line Items] |  |  |
Common stock | 74,998,000 |  |
Cumulative Redeemable Convertible Preferred Stock [Member] |  |  |
Common Stock Reserved For Future Issuance [Line Items] |  |  |
Common stock | 14,216,000 |  |
Sponsor Earn Out Securities [Member] |  |  |
Common Stock Reserved For Future Issuance [Line Items] |  |  |
Common stock | 6,250,000 |  |
Shares Available For Issuance Under The ESPP [Member] |  |  |
Common Stock Reserved For Future Issuance [Line Items] |  |  |
Common stock | 5,639,000 |  |
[1] | Common stock warrants include both equity-classified and liability-classified warrants (see Note 9).

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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