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Convertible Notes (Parenthetical) (Detail) (USD $)
1 Months Ended 3 Months Ended
Apr. 30, 2013
10% Senior Subordinated Convertible Notes due January 31, 2016
Jan. 31, 2013
10% Senior Subordinated Convertible Notes due January 31, 2016
Apr. 30, 2013
9% Senior Subordinated Convertible Notes due February 15, 2016
Jan. 31, 2013
9% Senior Subordinated Convertible Notes due February 15, 2016
Apr. 30, 2013
8% Senior Subordinated Convertible Notes due February 1, 2015
Debt Instrument [Line Items]          
Debt, interest rate 10.00%   9.00%   8.00%
Debt discounts $ 166,685 $ 183,389 $ 177,486 $ 186,897  
Debt instrument, maturity date Jan. 31, 2016   Feb. 15, 2016   Feb. 01, 2015