Summary of Changes in Convertible Debt Third Parties Net of Unamortized Discount (Detail) (USD $)	12 Months Ended	119 Months Ended
	Dec. 31, 2012	Dec. 31, 2012
Debt Instrument [Line Items]
July 25, 2012 Notes, face value	$ 3,455,000
Discount on convertible debt	(3,708,237)	(3,708,237)
Amortization of debt discount to interest expense through December 31, 2012	(104,032)	(6,856,730)
Balance at December 31, 2012	318,658	318,658
Beneficial Conversion Feature
Debt Instrument [Line Items]
Discount on convertible debt	(1,266,665)	(1,266,665)
Warrants Attached to Debt
Debt Instrument [Line Items]
Discount on convertible debt	(1,957,665)	(1,957,665)
Convertible debt
Debt Instrument [Line Items]
Amortization of debt discount to interest expense through December 31, 2012	$ 87,988