Balance Sheet Details - Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,525	$ 8,151
Less: accumulated depreciation	(6,713)	(6,380)
Total	1,812	1,771
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,541	4,252
Manufacturing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	82	82
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,544	1,488
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	851	822
Office Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,507	$ 1,507