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Financial Statement Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment	$ 58,259		$ 58,259		$ 56,752
Accumulated depreciation and amortization	(36,240)		(36,240)		(36,864)
Property and equipment, net	22,019		22,019		19,888
Depreciation expense	2,300	$ 2,200	4,500	$ 4,100
Computer and network equipment
Property, Plant and Equipment [Line Items]
Property and equipment	47,933		47,933		47,195
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment	7,571		7,571		6,974
Internal-use software development costs
Property, Plant and Equipment [Line Items]
Property and equipment	500		500		500
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	1,458		1,458		1,282
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 797		$ 797		$ 801

X

- 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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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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