Stock-Based Compensation - Summary of Allocated Stock-based Compensation Expense (Detail) - 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 |
Dec. 31, 2023 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||||||
| Stock-based compensation expense | $ 95 | $ 16 | $ 141 | $ 36 | $ 235 | $ 541 | $ 1,965 |
| Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense | |||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||||||
| Stock-based compensation expense | 61 | 3 | 91 | 8 | 184 | 399 | 1,274 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | |||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||||||
| Stock-based compensation expense | $ 34 | $ 13 | $ 50 | $ 28 | $ 51 | $ 142 | $ 691 |