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Convertible Notes (Parenthetical) (Detail) (USD $)
6 Months Ended
Sep. 30, 2014
Jul. 31, 2014
Mar. 31, 2014
Sep. 30, 2014
9% Senior Subordinated Convertible Notes due February 15, 2016
Mar. 31, 2014
9% Senior Subordinated Convertible Notes due February 15, 2016
Sep. 30, 2014
8% Senior Subordinated Convertible Notes due February 1, 2015
Debt Instrument [Line Items]            
Debt, interest rate   8.00%   9.00%   8.00%
Debt discount $ 1,183,856   $ 1,305,435 $ 99,973 $ 137,393 $ 1,046,811
Debt instrument, maturity date       Feb. 15, 2016