Property And Equipment, Net (Schedule Of Property And Equipment, Net) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 15,396	$ 2,141
Less: Accumulated depreciation and amortization	(2,134)	(1,421)
Property and equipment, net	13,262	720
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,057	630
Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,166	747
Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,648	229
Construction In Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	281	164
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 244	$ 371

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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