Income Taxes - Reconciliation Between Income Taxes at Statutory Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Income Taxes
Loss before income taxes	$ (13,868)	$ (10,440)
Tax (benefit) at statutory tax rate	(2,912)	(2,193)
Effects of:
Exclusion of incentive stock option expense	80	73
R&D tax credits	844	(451)
Increase (decrease) in valuation allowance	98	2,648
Section 182 limit - NOL	1,890	0
Other	0	(77)
Provision for income taxes	0	0
Unrecognized tax benefits	0
Unrecognized tax benefits, interest and penalties recorded	0
Unrecognized tax benefits, interest and penalties accrued	$ 0	$ 0