Selected Balance Sheet Information - Schedule of Property and equipment, net (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Selected Balance Sheet Information
Property, Plant and Equipment, Gross Total	$ 1,348	$ 1,210
Less: accumulated depreciation and amortization	(959)	(865)
Total	389	345
Computers and office equipment
Selected Balance Sheet Information
Property, Plant and Equipment, Gross Total	901	897
Other property, plant and equipment
Selected Balance Sheet Information
Property, Plant and Equipment, Gross Total	342	208
Leasehold improvements
Selected Balance Sheet Information
Property, Plant and Equipment, Gross Total	94	94
Software
Selected Balance Sheet Information
Property, Plant and Equipment, Gross Total	$ 11	$ 11