Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 2,790	$ 2,893
Less accumulated depreciation and amortization	(2,462)	(2,509)
Property and equipment, net	328	384
Laboratory equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	234	273
Software and computer equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	311	349
Machinery and equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	420	440
Furniture and fixtures [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	39	39
Vehicles [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	202	202
Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,584	$ 1,590