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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
Sep. 30, 2016
Aug. 31, 2016
May 31, 2016
Dec. 31, 2015
Dec. 22, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]          
Transfers between fair value measurement levels $ 0     $ 0  
Non-recurring fair value measurements 0     0  
Silver Creek [Member] | Convertible Promissory Notes [Member]          
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]          
Fair value of debt 1,200,000        
Aggregate principal amount of outstanding debt 1,200,000        
Aggregate principal amount of loan   $ 200,000 $ 1,000,000    
Interest rate (as a percent)     6.00%    
Senior Convertible Notes [Member]          
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]          
Aggregate principal amount of outstanding debt 46,000,000        
Senior Convertible Notes [Member] | Level 2 [Member]          
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]          
Fair value of debt 74,200,000        
2022 Notes [Member]          
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]          
Fair value of debt 173,500,000        
Aggregate principal amount of outstanding debt 169,700,000        
Aggregate principal amount of loan         $ 175,000,000
Interest rate (as a percent)         11.50%
Recurring Basis [Member]          
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]          
Liabilities measured at fair value $ 0     $ 0