Facility Lease - Lease cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating lease cost
Operating lease costs	$ 1,051	$ 1,046	$ 957
Costs of non-lease components (previously common area maintenance)	351	396	351
Total operating lease cost	1,402	1,442	1,308
Other Information
Operating cash flows used for operating lease	$ 1,695	$ 1,645	$ 1,506
Remaining lease term	2 years 1 month 6 days	3 years 1 month 6 days	2 years 1 month 6 days
Discount rate	8.00%	8.00%	10.00%