Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 12,965	$ 12,706
Less: accumulated depreciation and amortization	(6,190)	(5,559)
Property and equipment, net	6,775	7,147
Laboratory Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	8,243	8,032
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	3,361	3,342
Computer Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,313	1,284
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 48	$ 48

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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