Stock-Based Compensation - Stock based compensation expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Stock based compensation expense | ||||||
| Total stock-based compensation expense | $ 304 | $ 587 | $ 648 | $ 1,951 | $ 2,986 | $ 6,335 |
| Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense | ||||||
| Stock based compensation expense | ||||||
| Total stock-based compensation expense | 192 | 302 | 412 | 1,086 | 1,641 | 3,579 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | ||||||
| Stock based compensation expense | ||||||
| Total stock-based compensation expense | $ 112 | $ 285 | $ 236 | $ 865 | $ 1,345 | $ 2,756 |