Balance Sheet Components - Property and Equipment, net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 24,570	$ 24,145
Less: Accumulated depreciation and amortization	(16,717)	(16,862)
Property and equipment, net	7,853	7,283
Computer Equipment and Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,100	9,955
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,602	8,947
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,683	3,131
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,185	$ 2,112

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.

+ References+ Details

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.

+ References+ Details

- 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.

+ References+ Details