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Accounts payable, accrued expenses, and other liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Other Liabilities Disclosure [Abstract] |  |
Accounts payable and accrued expenses | $ 2,168 | $ 4,415
Other liabilities, current: |  |
Accrued compensation | 2,812 | 3,227
Operating lease liability | 23 | 31
Accrued directors fees | 0 | 39
Total | $ 5,003 | $ 7,712
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Total | Total
Other liabilities, non-current: |  |
Operating lease liability | $ 0 | $ 8
Total | $ 0 | $ 8
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Total | Total

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