Outstanding Warrants to Purchase Shares of Common Stock (Detail)	12 Months Ended
	Dec. 31, 2012
Class of Warrant or Right [Line Items]
Warrants Issued	10,804,695
Weighted Average Exercise Price	0.99
Exercised	5,000
Warrants Outstanding	10,799,695
Period Issuance01
Class of Warrant or Right [Line Items]
Grant Date	Jul. 15, 2009
Warrants Issued	2,909,695
Weighted Average Exercise Price	1.84
Expiration Date	Jul. 14, 2014
Exercised	5,000
Warrants Outstanding	2,904,695
Period Issuance01 | Minimum
Class of Warrant or Right [Line Items]
Exercise Price Range	1.25
Period Issuance01 | Maximum
Class of Warrant or Right [Line Items]
Exercise Price Range	2.28
Period Issuance02
Class of Warrant or Right [Line Items]
Grant Date	Apr. 21, 2010
Warrants Issued	2,632,500
Exercise Price Range	0.94
Weighted Average Exercise Price	0.94
Expiration Date	Apr. 20, 2015
Exercised	0
Warrants Outstanding	2,632,500
Period Issuance03
Class of Warrant or Right [Line Items]
Grant Date	Jun. 20, 2011
Warrants Issued	2,750,000
Exercise Price Range	0.60
Weighted Average Exercise Price	0.60
Expiration Date	Jun. 19, 2016
Exercised	0
Warrants Outstanding	2,750,000
Period Issuance04
Class of Warrant or Right [Line Items]
Grant Date	Apr. 04, 2012
Warrants Issued	2,512,500
Exercise Price Range	0.50
Weighted Average Exercise Price	0.50
Expiration Date	Apr. 03, 2017
Exercised	0
Warrants Outstanding	2,512,500