Selected Balance Sheet Information - Schedule of Property and equipment, net (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Selected Balance Sheet Information
Property, Plant and Equipment, Gross Total	$ 1,412	$ 1,424
Less: accumulated depreciation and amortization	(1,037)	(1,002)
Total	375	422
Computers and office equipment
Selected Balance Sheet Information
Property, Plant and Equipment, Gross Total	900	902
Other property, plant and equipment
Selected Balance Sheet Information
Property, Plant and Equipment, Gross Total	407	417
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