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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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Balance Sheet Details (Details) (USD $)	12 Months Ended
Balance Sheet Details (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, plant and equipment, net
Property, plant and equipment, gross	$ 136,998,000	$ 111,977,000
Less accumulated depreciation and amortization	(55,893,000)	(44,207,000)
Property, plant and equipment, net	81,105,000	67,770,000
Net book value	81,105,000	67,770,000
Depreciation expense	11,894,000	10,101,000	10,661,000
Building
Property, plant and equipment, net
Property, plant and equipment, gross	42,958,000	42,230,000
Building \| Sunnyvale, California
Property, plant and equipment, net
Property, plant and equipment, net	39,100,000	39,700,000
Construction in progress, capitalized		25,100,000
Construction costs capitalized		13,100,000
Interest capitalized		1,500,000
Net book value	39,100,000	39,700,000
Property, plant and equipment, useful life (in years)	P39Y
Building \| Brecksville, Ohio
Property, plant and equipment, net
Property, plant and equipment, net	2,300,000	2,500,000
Construction in progress, capitalized		800,000
Construction costs capitalized		1,700,000
Net book value	2,300,000	2,500,000
Property, plant and equipment, useful life (in years)	P39Y
Computer software
Property, plant and equipment, net
Property, plant and equipment, gross	34,403,000	29,985,000
Computer equipment
Property, plant and equipment, net
Property, plant and equipment, gross	27,834,000	23,996,000
Furniture and fixtures
Property, plant and equipment, net
Property, plant and equipment, gross	10,019,000	8,827,000
Leasehold improvements
Property, plant and equipment, net
Property, plant and equipment, gross	3,810,000	3,325,000
Machinery
Property, plant and equipment, net
Property, plant and equipment, gross	9,711,000	2,776,000
Construction in progress
Property, plant and equipment, net
Property, plant and equipment, gross	8,263,000	838,000
Construction in progress \| Sunnyvale, California
Property, plant and equipment, net
Construction in progress, capitalized	6,200,000
Construction in progress \| Brecksville, Ohio
Property, plant and equipment, net
Construction in progress, capitalized	$ 1,200,000