Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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)(2))

-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

-Subparagraph 2

-Article 4

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

Derivative Financial Instruments - Additional Information (Detail) (USD $)	Oct. 11, 2013	May 10, 2012	Nov. 08, 2011	Apr. 08, 2011	Oct. 11, 2010
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Issued warrants to acquire common shares		260,417	1,302,083	525,000	1,800,000
Common stock, shares exercised	1,725,000
Shares accessible based upon election to require		434,027	434,027
Original principal amount		$ 8,000,000