Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment	$ 19,114		$ 15,454
Less: accumulated depreciation	(6,279)		(5,100)
Property and equipment, net	12,835		10,354
Depreciation and amortization expense	1,180	$ 696
Computer, equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment	3,442		2,218
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	1,463		915
Capitalized internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment	12,545		11,229
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 1,664		$ 1,092

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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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