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Assumptions Used In Binomial Valuation Model and Black-Scholes Valuation Model (Detail) (Warrants)
12 Months Ended 9 Months Ended
Dec. 31, 2009
Sep. 30, 2014
Black Scholes Option Pricing Model
Sep. 30, 2013
Black Scholes Option Pricing Model
Class of Warrant or Right [Line Items]      
Risk-free interest rate 2.14% 0.02% 0.10%
Expected life in years 5 years 2 months 9 days 1 year 2 months 9 days
Expected volatility   65.00% 75.00%
Expected dividend yield 0.00% 0.00% 0.00%
Steps Per Year   125 13