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Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Detail) (USD $)
12 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Monte Carlo Simulations [Member]
Senior Convertible Notes [Member]
Aug. 14, 2014
Monte Carlo Simulations [Member]
Monaco Notes [Member]
Sep. 30, 2014
Monte Carlo Simulations [Member]
Monaco Notes [Member]
Dec. 31, 2013
Minimum [Member]
Monte Carlo Simulations [Member]
Senior Convertible Notes [Member]
Aug. 14, 2014
Minimum [Member]
Monte Carlo Simulations [Member]
Monaco Notes [Member]
Sep. 30, 2014
Minimum [Member]
Monte Carlo Simulations [Member]
Monaco Notes [Member]
Dec. 31, 2013
Maximum [Member]
Monte Carlo Simulations [Member]
Senior Convertible Notes [Member]
Aug. 14, 2014
Maximum [Member]
Monte Carlo Simulations [Member]
Monaco Notes [Member]
Sep. 30, 2014
Maximum [Member]
Monte Carlo Simulations [Member]
Monaco Notes [Member]
Derivative [Line Items]                    
Quoted market price/ underlying price on valuation date $ 2.50 $ 2.02 $ 2.50 $ 2.50            
Contractual conversion rate   $ 3.17                
Range of effective contractual conversion rates                     
Contractual term to maturity   3 months 29 days 2 years 1 year 10 months 13 days            
Implied expected term to maturity   3 months 29 days 1 year 10 months 6 days 1 year 8 months 5 days            
Market volatility:                    
Range of volatilities         47.40% 37.00% 55.50% 91.20% 62.20% 70.50%
Range of equivalent volatilities     51.20% 62.30% 59.90%     69.90%    
Contractual interest rate         8.00% 8.00% 8.00% 9.00% 11.00% 11.00%
Range of equivalent market risk adjusted interest rates     9.50% 9.50% 8.08%     9.08%    
Range of equivalent credit risk adjusted yields   0.67% 4.15% 4.24%   3.94% 3.97%   4.45% 4.61%
Risk-free rates         0.01%     0.07%