Balance Sheet Details - Components of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment at cost	$ 5,738	$ 5,570
Less accumulated depreciation and amortization	2,103	1,624
Total	3,635	3,946
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment at cost	3,494	3,494
Lab Equipment
Property Plant And Equipment [Line Items]
Property and equipment at cost	1,550	1,468
Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment at cost	653	567
Computers and Software
Property Plant And Equipment [Line Items]
Property and equipment at cost	$ 41	$ 41

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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