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Summary of Level 3 Inputs to Monte Carlo (Detail) (Level 3, USD $)
1 Months Ended 3 Months Ended
Jan. 24, 2013
Mar. 31, 2013
Level 3
   
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Stock price $ 6.88 $ 7.80
Conversion rate 121.1240 121.1240
Conversion price $ 8.26 $ 8.26
Maturity date Nov. 01, 2016 Nov. 01, 2016
Risk-free interest rate 0.79% 0.74%
Estimated stock volatility 50.00% 50.00%