Balance Sheet Components - Schedule of Property and Equipment Net (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 24,965	$ 21,140
Less accumulated depreciation and amortization	(8,017)	(4,832)
Total property and equipment, net	16,948	16,308
Laboratory Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	14,174	11,986
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	556	540
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,444	1,351
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	7,274	7,121
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,517	$ 142

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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