Summary of Significant Accounting Policies - Useful Life - Additional Information (Detail)	12 Months Ended
Dec. 31, 2013
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the asset	3 years
Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the asset	5 years
Furniture [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the asset	7 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Leasehold improvements description	Leasehold improvements are amortized over the estimated useful life or the remaining lease term, whichever is shorter

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

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