Balance Sheet Account Details (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Property and equipment, net
Property and equipment, Gross	$ 50,706	$ 24,876
Less: accumulated depreciation	(11,620)	(4,181)
Total property and equipment, net	39,086	20,695
Computer equipment and software [Member]
Property and equipment, net
Property and equipment, Gross	41,919	16,586
Furniture and Fixtures [Member]
Property and equipment, net
Property and equipment, Gross	3,017	1,755
Leasehold Improvements [Member]
Property and equipment, net
Property and equipment, Gross	815	2,795
Construction in Progress [Member]
Property and equipment, net
Property and equipment, Gross	$ 4,955	$ 3,740

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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