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Weighted-Average Assumptions used in Calculations of Fair Value (Detail)
6 Months Ended
Jun. 30, 2012
Black-Scholes-Merton
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Volatility 100.00%
Expected life of options (in years) 6 years
Risk-free interest rate 0.92%
Dividend yield 0.00%
Forfeiture rate 0.00%
Monte Carlo Simulation
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Volatility 94.00%
Expected life of options (in years) 6 years
Risk-free interest rate 1.64%
Dividend yield 0.00%
Forfeiture rate 0.00%