Summary of Changes in Convertible Debt Third Parties Net of Unamortized Discount (Detail) (USD $)	6 Months Ended	125 Months Ended
	Jun. 30, 2013	Jun. 30, 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)	(761,222)
Amortization of debt discount to interest expense through June 30, 2013	(1,382,977)	(8,239,707)
Balance at June 30, 2013	418,701	418,701
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 June 30, 2013	1,285,872
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)