Balance Sheet Components (Summary of Property and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 49,553	$ 45,483
Less accumulated depreciation	32,036	27,988
Total	17,517	17,495
Computer Equipment And Software
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	42,004	38,649
Furniture, Equipment and Building Improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 7,549	$ 6,834

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived 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, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived 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, furniture and fixtures, and computer equipment.

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