Property and Equipment - Components of property and equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,246	$ 2,203
Less: accumulated depreciation	1,042	1,297
Property and equipment, net	204	906
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	22	505
Furniture and fixtures, office equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	896	889
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 328	$ 809