Warrant Activity (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013
Class of Warrant or Right [Line Items]
Number of Warrants, Outstanding at December 31, 2012	18,190,906
Granted, Number of Warrants	0
Exercised, Number of Warrants	0
Expired or cancelled, Number of Warrants	(320,000)
Number of Warrants, Outstanding and exercisable at March 31, 2013	17,870,906
Weighted Average Exercise Price, Outstanding at December 31, 2012	0.225
Granted, Weighted Average Exercise Price	0
Exercised, Weighted Average Exercise Price	0
Expired or cancelled, Weighted Average Exercise Price	1.60
Weighted Average Exercise Price, Outstanding and exercisable at March 31, 2013	0.201
Granted, Remaining Contractual Term	0 years
Exercised, Remaining Contractual Term	0 years
Expired or cancelled, Remaining Contractual Term	0 years
Aggregate Intrinsic Value, Outstanding at December 31, 2012	$ 0
Granted, Aggregate Intrinsic Value	0
Exercised, Aggregate Intrinsic Value	0
Expired or cancelled, Aggregate Intrinsic Value	0
Aggregate Intrinsic Value, Outstanding and exercisable at March 31, 2013	$ 187,500
Maximum
Class of Warrant or Right [Line Items]
Remaining Contractual Term, Outstanding at December 31, 2012	106 months
Remaining Contractual Term, Outstanding and exercisable at March 31, 2013	103 months
Minimum
Class of Warrant or Right [Line Items]
Remaining Contractual Term, Outstanding at December 31, 2012	1 month
Remaining Contractual Term, Outstanding and exercisable at March 31, 2013	24 months