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Balance Sheet Components - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 19,374	$ 20,721
Less accumulated depreciation and amortization	(18,027)	(17,860)
Property, plant and equipment, net	1,347	2,861
Depreciation expense	884	1,100
Capitalized computer software, amortization	106	157
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,787	2,759
Office equipment and office furniture
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,071	7,827
Capitalized internal-use software and website development
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,390	4,390
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,126	$ 5,745

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- Definition

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 of expense for amortization of capitalized computer software costs.

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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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