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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Balance sheet components (Property and equipment) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 10,216		$ 9,340	$ 6,942
Less: Accumulated depreciation	(7,522)		(6,639)	(5,635)
Property and equipment, net	2,694		2,701	1,307	1,311
Depreciation and amortization expense	842	309	1,004	732	754
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,173		3,712	2,644
Furniture fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	966		1,018	666
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,680		1,493	1,070
Manufacturing tools and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,290		3,027	2,229
Construction in process
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 107		$ 90	$ 333