Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 51,267	$ 37,921
Accumulated depreciation and amortization	(21,848)	(15,805)
Property and equipment, net	29,419	22,116
Electronic equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	12,396	11,429
Office and other equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	8,975	6,152
Vehicles
Property Plant And Equipment [Line Items]
Property and equipment, gross	16,369	12,775
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	10,542	7,340
Construction in progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 2,985	$ 225

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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