Estimated Useful Life of Assets (Detail)	12 Months Ended
Dec. 31, 2012
Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Life	Shorter of the term of the lease or estimated useful life
Equipment \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Equipment \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	8 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-URI http://asc.fasb.org/subtopic&trid=2155824

Name:	us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration