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Inputs Included in Option Pricing Model (Detail)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Time to liquidity (in years) 2 years 6 months
Volatility 53.00% 57.00%
Discounted cash flow rate 14.00% 14.00%
Risk free interest rate 0.25% 0.21%
Marketability discount rate 27.00% 20.00%