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Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Detail) - $ / shares
Mar. 08, 2016
Dec. 31, 2015
Dec. 01, 2014
Oct. 01, 2014
Aug. 14, 2014
Dec. 31, 2016
Dec. 31, 2013
Derivative [Line Items]              
Underlying price on valuation date   $ 2.50 $ 2.50 $ 2.50 $ 2.50 $ 1.25 $ 2.50
Monte Carlo Simulations [Member] | Monaco Notes [Member] | First Tranche [Member]              
Derivative [Line Items]              
Underlying price on valuation date $ 1.25 2.50     2.50    
Contractual conversion rate $ 3.15 $ 3.15     $ 3.15    
Contractual term to maturity 1 year 9 months 25 days 2 years     2 years    
Implied expected term to maturity 1 year 2 months 27 days 1 year 9 months 25 days     1 year 10 months 6 days    
Market volatility:              
Range of equivalent volatilities 120.10% 98.10%     51.20%    
Contractual interest rate 11.00% 11.00%          
Range of equivalent market risk adjusted interest rates 11.60% 11.00%     9.50%    
Range of equivalent credit risk adjusted yields 4.13% 3.76%     4.15%    
Range of equivalent credit risk adjusted yields 4.13% 3.76%     4.15%    
Monte Carlo Simulations [Member] | Monaco Notes [Member] | Second Tranche [Member]              
Derivative [Line Items]              
Underlying price on valuation date $ 1.25 $ 2.50   2.50      
Contractual conversion rate $ 3.15 $ 3.15   $ 3.15      
Contractual term to maturity 1 year 9 months 25 days 2 years   2 years      
Implied expected term to maturity 1 year 2 months 27 days 1 year 2 months 27 days   1 year 9 months 14 days      
Market volatility:              
Range of equivalent volatilities 120.10% 98.10%   68.00%      
Contractual interest rate 11.00% 11.00%          
Range of equivalent market risk adjusted interest rates 11.60% 11.00%   9.25%      
Range of equivalent credit risk adjusted yields 4.13% 3.76%   4.24%      
Range of equivalent credit risk adjusted yields 4.13% 3.76%   4.24%      
Monte Carlo Simulations [Member] | Monaco Notes [Member] | Third Tranche [Member]              
Derivative [Line Items]              
Underlying price on valuation date $ 1.25 $ 2.50 2.50        
Contractual conversion rate $ 3.15 $ 3.15 $ 3.15        
Contractual term to maturity 1 year 9 months 25 days 2 years 2 years        
Implied expected term to maturity 1 year 2 months 27 days 1 year 9 months 25 days 1 year 9 months 3 days        
Market volatility:              
Range of equivalent volatilities 120.10% 98.10% 72.20%        
Contractual interest rate 11.00% 11.00%          
Range of equivalent market risk adjusted interest rates 11.60% 11.00% 9.25%        
Range of equivalent credit risk adjusted yields 4.13% 3.76% 4.52%        
Range of equivalent credit risk adjusted yields 4.13% 3.76% 4.52%        
Minimum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | First Tranche [Member]              
Market volatility:              
Range of volatilities 96.00% 85.20%     37.00%    
Contractual interest rate         8.00%    
Range of equivalent credit risk adjusted yields 3.49% 3.29%     3.94%    
Range of equivalent credit risk adjusted yields 3.49% 3.29%     3.94%    
Minimum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | Second Tranche [Member]              
Market volatility:              
Range of volatilities 96.00% 85.20%   58.60%      
Contractual interest rate       8.00%      
Range of equivalent credit risk adjusted yields 3.49% 3.29%   3.97%      
Range of equivalent credit risk adjusted yields 3.49% 3.29%   3.97%      
Minimum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | Third Tranche [Member]              
Market volatility:              
Range of volatilities 96.00% 85.20% 61.80%        
Contractual interest rate     8.00%        
Range of equivalent credit risk adjusted yields 3.49% 3.29% 4.29%        
Range of equivalent credit risk adjusted yields 3.49% 3.29% 4.29%        
Maximum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | First Tranche [Member]              
Market volatility:              
Range of volatilities 154.00% 109.80%     62.20%    
Contractual interest rate         11.00%    
Range of equivalent credit risk adjusted yields 5.02% 4.22%     4.45%    
Range of equivalent credit risk adjusted yields 5.02% 4.22%     4.45%    
Maximum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | Second Tranche [Member]              
Market volatility:              
Range of volatilities 154.00% 109.80%   75.30%      
Contractual interest rate       11.00%      
Range of equivalent credit risk adjusted yields 5.02% 4.22%   4.61%      
Range of equivalent credit risk adjusted yields 5.02% 4.22%   4.61%      
Maximum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | Third Tranche [Member]              
Market volatility:              
Range of volatilities 154.00% 109.80% 79.80%        
Contractual interest rate     11.00%        
Range of equivalent credit risk adjusted yields 5.02% 4.22% 4.84%        
Range of equivalent credit risk adjusted yields 5.02% 4.22% 4.84%