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Balance Sheet Components - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 50,483	$ 37,797
Less accumulated depreciation and amortization	(13,325)	(10,072)
Property and equipment, net	37,158	27,725
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	1,212	599
Laboratory equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	11,065	9,354
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	1,484	1,259
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	28,393	24,631
Construction in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 8,329	$ 1,954

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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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