Summary of Changes in Convertible Debt Third Parties Net of Unamortized Discount (Detail) (USD $)	3 Months Ended	122 Months Ended
	Mar. 31, 2013	Mar. 31, 2013
Debt Instrument [Line Items]
Balance at December 31, 2012	$ 318,658
January 2013 Notes, face value	550,000
Repayment of January 23, 2013 Notes	(450,000)
Amortization of debt discount to interest expense through March 31, 2013	(1,237,662)	(8,094,392)
Balance at March 31, 2013	301,410	301,410
Beneficial Conversion Feature
Debt Instrument [Line Items]
Discount on convertible debt	(120,009)	(120,009)
Warrants Attached to Debt
Debt Instrument [Line Items]
Discount on convertible debt	(165,820)	(165,820)
Convertible debt
Debt Instrument [Line Items]
Amortization of debt discount to interest expense through March 31, 2013	1,168,581
January 2013 Notes
Debt Instrument [Line Items]
Principal amount of Notes converted to common stock	(100,000)
July 2012 Notes
Debt Instrument [Line Items]
Principal amount of Notes converted to common stock	$ (900,000)