Outstanding Warrant Liability - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended			81 Months Ended						12 Months Ended			81 Months Ended				1 Months Ended	12 Months Ended		81 Months Ended	12 Months Ended			12 Months Ended
	Oct. 19, 2009	Jan. 31, 2009	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2012	Feb. 26, 2013	Dec. 31, 2010	Jan. 01, 2009	Dec. 03, 2007	Jul. 13, 2007	Dec. 31, 2009 Expired in August 2010	Dec. 31, 2012 August and December 2007 Warrants	Dec. 31, 2011 August and December 2007 Warrants	Dec. 31, 2012 August and December 2007 Warrants	Jan. 01, 2009 August and December 2007 Warrants	Jan. 31, 2009 August and December 2007 Warrants Expire in December 2012	Jan. 31, 2009 August and December 2007 Warrants Expired in August 2010	Jan. 31, 2011 January 2011 Warrants	Dec. 31, 2012 January 2011 Warrants	Dec. 31, 2011 January 2011 Warrants	Dec. 31, 2012 January 2011 Warrants	Dec. 31, 2012 August 2007	Dec. 31, 2012 December 2007	Dec. 31, 2012 December 2012	Dec. 31, 2007 Investor Relations Agreements Warrant
Class of Warrant or Right [Line Items]
Warrants no longer afforded equity treatment				428,571					6,962,963								5,962,563	1,000,000							5,962,963
Warrants exercise price			0.00			0.00	0.00	0.50		2.9	5.00					2.90			0.55
Cumulative effect of warrants reclassified		$ 15,700,000
Reclassification of long term warrant liability		2,900,000			(2,915,136)
Gain (Loss) from change in fair value of warrant liability			12,326	855,251		2,944,816							(1,000)	764,000	2,516,000					11,498	91,467	102,935
Warrant expiration date	Aug-10							2013-12-15					2012-12		2012-12				2016-01
Number of private offerings			2
Common shares issued (in shares)																			428,571				689,655	5,740,741
Cancellation of warrants	673,200
Cancellation of warrants value	220,000
Warrants issued												326,800
Gain on change in fair value of warrant liability	208,562											117,468
Remaining fair value of warrant liability	73,282
Loss on the retirements of warrants	146,718		0	0		(146,718)
Retirement of Aurarian warrants			0	0		220,000
Fair value of warrants																										$ 269,839