Accounts payable, accrued expenses, and other liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Other Liabilities Disclosure [Abstract]
Accounts payable and accrued expenses	$ 3,436	$ 4,415
Other liabilities, current:
Accrued compensation and benefits	3,843	3,227
Accrued directors’ fees	52	39
Operating lease liability	15	31
Total	$ 7,346	$ 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