Property and Equipment, Net - Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation	$ (639)	$ (406)
Total property and equipment, net	1,186	847
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	51	51
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	361	222
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	980	980
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 433	$ 0