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Assumptions Used In Binomial and Monte Carlo Valuation Model (Detail)
Dec. 31, 2009
Y
Jun. 30, 2013
Binomial/Monte Carlo Option Pricing Model
Y
Jun. 30, 2012
Binomial/Monte Carlo Option Pricing Model
Y
Jun. 30, 2013
Binomial/Monte Carlo Option Pricing Model
Minimum
Y
Jun. 30, 2012
Binomial/Monte Carlo Option Pricing Model
Minimum
Y
Class of Warrant or Right [Line Items]          
Risk-free interest rate 2.14% 0.26% 0.37%    
Expected volatility 105.00% 70.00% 70.00%    
Expected dividend yield 0.00% 0.00% 0.00%    
Expected life in years 5 12 12 1.44 2.44