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Fair Value of Financial Instruments - Additional Information (Detail) (Warrant, USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Warrant
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value of warrant liability $ 58,639
Market price of common stock $ 12.25
Risk-free rate 0.015%
Warrants expected term 73 days
Dividend yield 0.00%
Volatility rate 59.90%