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Derivative Liabilities - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative [Line Items]      
Warrant exercise price     1.00
Expected life 2 years 4 months 24 days    
Fair value assumptions, expected dividend rate 0.00%    
Volatility 50.00%    
Risk-free interest rate 0.30%    
Convertible debt, noncurrent $ 6,770,478 $ 5,671,162  
Issuances date
     
Derivative [Line Items]      
Fair value assumptions, expected dividend rate 0.00%    
Volatility 50.00%    
Risk-free interest rate 0.40%    
10% Convertible Redeemable Preferred Stock
     
Derivative [Line Items]      
Warrant exercise price 10    
Warrants to purchase 10% Convertible Preferred Stock 10.00%    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 58,352    
Expected life 5 years    
Fair value assumptions, expected dividend rate 0.00%    
Volatility 129.00%    
Risk-free interest rate 2.10%    
Placement Agent Warrants
     
Derivative [Line Items]      
Warrants Not Settleable in Cash, Fair Value Disclosure 216,000 81,700  
Change in fair value of warrant liability 134,300    
Conversion Options
     
Derivative [Line Items]      
Derivative liability at fair value 4,800,000    
Increase decrease in fair value of un hedged derivative instruments 3,600,000    
Conversion Options | Issuances date
     
Derivative [Line Items]      
Derivative liability at fair value 545,400    
Warrant
     
Derivative [Line Items]      
Increase decrease in fair value of un hedged derivative instruments 1,800,000    
Warrant | Issuances date
     
Derivative [Line Items]      
Derivative liability at fair value 249,200    
Warrant | Issuances date | Derivative
     
Derivative [Line Items]      
Derivative liability at fair value $ 2,300,000