Net Loss per Share Attributable to Common Stockholders - Anti-dilutive effect (Details) - shares |
6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Antidilutive Securities | ||||
| Antidilutive securities excluded from computation of diluted net loss per share | 1,015,018 | 855,087 | ||
| Option to purchase common stock | ||||
| Antidilutive Securities | ||||
| Antidilutive securities excluded from computation of diluted net loss per share | 1,015,018 | 855,087 | 848,966,000 | 737,895,000 |