Leases - Components of lease costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Lease costs:
Operating lease cost	$ 24	$ 24	$ 48	$ 48
Variable lease cost	21	18	43	40
Total lease costs	$ 45	$ 42	$ 91	$ 88