Number of Warrants Outstanding (Detail)	Mar. 31, 2014	Dec. 31, 2013
Class of Warrant or Right [Line Items]
Warrant outstanding	10,539,767	10,539,767
Liability
Class of Warrant or Right [Line Items]
Warrant outstanding	8,235,076	8,235,076
Equity
Class of Warrant or Right [Line Items]
Warrant outstanding	2,304,691	2,304,691

Number of warrants or rights outstanding.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant