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Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 08, 2023 $ / shares shares | Jun. 30, 2025 shares | Dec. 31, 2024 shares | Apr. 30, 2024 shares | Dec. 31, 2023 shares | Dec. 31, 2021 USD ($) $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock shares authorized |  | 20,000,000 |  |  |  |
Allen and Company LLC [Member] | Warrants Convertible Into Class A Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Class of warrants or rights number of securities covered by warrants or rights | 150,000 |  |  |  |  |
Class of warrants or rights exercise price | $ / shares | $ 10 |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock shares authorized |  | 1,000,000,000 | 1,000,000,000 | 204,590,500 | 200,228,024 |
Common Class A [Member] | Exercise of Warrants [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock issued during period shares new issues | 109,459 |  |  |  |  |
Common Class A [Member] | Master Services Agreement With Astra Zeneca As Amended [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Class of warrants value of shares covered by warrants or rights | $ |  |  |  |  |  | $ 100
Class of warrants or rights number of securities covered by warrants or rights |  |  |  |  |  | 2,702,703
Class of warrants or rights exercise price | $ / shares |  |  |  |  |  | $ 37
Common Class B [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock shares authorized |  | 5,500,000 | 5,500,000 |  | 5,374,899 |
Stockholders equity stock split |  | 1 |  |  |  |
Duration before which shares may be converted from one class to another |  | 20 years |  |  |  |
Share holding below which trigger is caused for conversion of stock from one class to another |  | 10,000,000 |  |  |  |
Common Class B [Member] | Maximum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of days for determining conversion of stock from class to another |  | 150 days |  |  |  |
Number of days for determining ownership of the founder below which conversion of stock from one class to another is triggered |  | 150 days |  |  |  |
Common Class B [Member] | Minimum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of days for determining conversion of stock from class to another |  | 90 days |  |  |  |
Number of days for determining ownership of the founder below which conversion of stock from one class to another is triggered |  | 90 days |  |  |  |
Non-voting Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock shares authorized |  | 0 | 0 |  | 66,946,627 |

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