Property and Equipment, Net - Schedule of Property Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 7,344	$ 7,142
Less: accumulated depreciation and amortization	(5,462)	(5,234)
Total property and equipment, net	1,882	1,908
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,770	5,568
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	182	182
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,008	1,008
Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	35	35
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 349	$ 349