Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property and equipment disclosures
Property, plant and equipment, gross	$ 39,393	$ 28,019
Less accumulated depreciation and amortization	(13,460)	(8,285)
Property and equipment, net	25,933	19,734
Computers, machinery and equipment
Property and equipment disclosures
Property, plant and equipment, gross	20,574	12,176
Furniture and fixtures
Property and equipment disclosures
Property, plant and equipment, gross	1,453	1,433
Leasehold and tenant improvements
Property and equipment disclosures
Property, plant and equipment, gross	13,583	13,583
Construction in progress
Property and equipment disclosures
Property, plant and equipment, gross	$ 3,783	$ 827

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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