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Derivative Liabilities - Additional Information (Detail) - Range [Domain] - Class of Stock [Domain] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Derivative [Line Items]      
Expected life   2 months 1 day  
Volatility   35.00%  
Risk-free interest rate   0.01%  
Fair Value Assumptions, Expected Dividend Rate   0.00%  
10% Convertible Redeemable Preferred Stock      
Derivative [Line Items]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 58,352 58,352  
Expected life   1 year  
Volatility   85.00%  
Risk-free interest rate   0.30%  
Convertible preferred stock per share $ 10 $ 10  
Fair Value Assumptions, Expected Dividend Rate   0.00%  
8% Convertible promissory note      
Derivative [Line Items]      
Increase decrease in fair value of un hedged derivative instruments $ 381,000 $ 2,000,000  
12% Convertible Promissory Notes      
Derivative [Line Items]      
Derivative liability at fair value 176,000 176,000  
Increase decrease in fair value of un hedged derivative instruments 18,000 107,000  
Warrant | Placement Agent      
Derivative [Line Items]      
Warrants Not Settleable in Cash, Fair Value Disclosure $ 121 $ 121 $ 52,720