v2.4.0.6
Valuation of Warrants Using Fair Value Method Under Black-Scholes valuation model (Detail) (Warrant [Member])
0 Months Ended
Nov. 13, 2012
Sep. 20, 2012
Warrant [Member]
   
Senior Convertible Notes and Warrants Disclosure [Line Items]    
Contractual Term 5 years 5 years
Volatility 119.15% 117.57%
Dividend yield 0.00% 0.00%
Risk-free interest rate 0.63% 0.70%