Commitments and Contingencies - Components of lease expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating lease costs:
Operating lease expense	$ 361	$ 351	$ 1,100	$ 1,097
Other income	(342)	(357)	(1,062)	(1,054)
Total operating lease costs	19	(6)	38	43
Finance lease costs:
Amortization of right-of-use assets	2	2	7	7
Total finance lease costs	$ 2	$ 2	$ 7	$ 7