Balance Sheet Details (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of equipment and improvements
Gross, Total	$ 24,101	$ 24,272
Less accumulated depreciation and amortization	(12,890)	(8,790)
Equipment and improvements, net	11,211	15,482
Computer hardware, software, and equipment [Member]
Summary of equipment and improvements
Gross, Total	16,122	16,277
Leasehold improvements [Member]
Summary of equipment and improvements
Gross, Total	6,368	6,283
Office furniture and fixtures [Member]
Summary of equipment and improvements
Gross, Total	$ 1,611	$ 1,712

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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