Summary of Significant Accounting Policies - Net loss per share (Details) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Subsidiary, Sale of Stock [Line Items] | ||
| Total | $ 17,802,706 | $ 11,383,403 |
| Options to purchase common stock | ||
| Subsidiary, Sale of Stock [Line Items] | ||
| Total | 13,408,228 | 8,642,053 |
| Unvested restricted common stock | ||
| Subsidiary, Sale of Stock [Line Items] | ||
| Total | $ 4,394,478 | $ 2,741,350 |