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Convertible Notes (Parenthetical) (Detail) (USD $)
1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Oct. 16, 2009
10% Senior Subordinated Convertible Notes due January 31, 2013
Jul. 31, 2012
10% Senior Subordinated Convertible Notes due January 31, 2013
Jan. 31, 2012
10% Senior Subordinated Convertible Notes due January 31, 2013
Sep. 01, 2011
8% Senior Subordinated Convertible Notes due February 1, 2015
Jul. 31, 2012
8% Senior Subordinated Convertible Notes due February 1, 2015
Jan. 31, 2012
8% Senior Subordinated Convertible Notes due February 1, 2015
Debt Instrument [Line Items]            
Convertible notes, interest rate 10.00% 10.00% 10.00% 8.00% 8.00% 8.00%
Convertible notes, debt discount   $ 326,718 $ 653,026      
Convertible notes, maturity date Jan. 31, 2013 Jan. 31, 2013 Jan. 31, 2013 Feb. 01, 2015 Feb. 01, 2015 Feb. 01, 2015