Employee Benefit Plan - Additional Information (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Defined Contribution Plan [Abstract] | ||
| Defined contribution plan, description | The Horizon Kinetics LLC 401(k) Plan is a defined contribution plan which was adopted as of October 31, 2011 | |
| Total expense of operating the plan | $ 8 | $ 14 |