Common Stock Purchase Warrants (Detail)					12 Months Ended				12 Months Ended						12 Months Ended
	Dec. 31, 2012	Nov. 30, 2012	Oct. 31, 2012	Dec. 31, 2012 Series B Convertible Preferred Holders	Dec. 31, 2012 Series B Convertible Preferred Holders Maximum	Dec. 31, 2012 Series B Convertible Preferred Holders Minimum	Dec. 31, 2012 Agent Warrants 2009	Dec. 31, 2012 Series C Convertible Preferred Holders	Dec. 31, 2012 Series C Convertible Preferred Holders Maximum	Dec. 31, 2012 Series C Convertible Preferred Holders Minimum	Dec. 31, 2012 Agent Warrants - 2010	Dec. 31, 2012 Agent Initial Engagement Warrants	Dec. 31, 2012 Agent Warrants - 2012 One	Dec. 31, 2012 Convertible Debenture Holders Two [Member]	Dec. 31, 2012 Convertible Debenture Holders Two [Member] Maximum	Dec. 31, 2012 Convertible Debenture Holders Two [Member] Minimum	Dec. 31, 2012 Agent Warrants 2012 Two
Warrants Disclosure [Line Items]
Warrants Issuance Date					Dec. 22, 2009	May 18, 2009	Oct. 31, 2009		Jun. 11, 2010	Apr. 27, 2010	Jun. 11, 2010	Aug. 04, 2011	Mar. 30, 2012		Dec. 31, 2012	Aug. 28, 2012	Dec. 31, 2012
Warrants Expiry Date					Dec. 22, 2014	May 18, 2014	Oct. 31, 2014		Jun. 11, 2015	Apr. 27, 2015	Jun. 11, 2015	Aug. 04, 2016	Mar. 30, 2017		Dec. 31, 2017	Aug. 28, 2017	Dec. 31, 2017
Warrants Exercise Price		0.1287	0.1287	0.3			0.35	0.3			0.35	0.08	0.0745	0.1287			0.1287
Warrants outstanding at December 31, 2012	59,066,992			12,457,500			2,500,000	7,883,078			1,576,616	1,485,838	6,066,870	5,066,453			1,519,936