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Balance Sheet Components - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 22,351	$ 23,295
Less accumulated depreciation and amortization	(17,430)	(17,137)
Property, plant and equipment, net	4,921	6,158
Depreciation expense	1,800	2,100	$ 2,200
Capitalized computer software, amortization	321	460	$ 308
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,337	4,969
Office equipment and office furniture
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,002	8,802
Capitalized internal-use software and website development
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,383	3,265
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,629	$ 6,259

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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- Definition

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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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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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