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Fair Value Measurements - Summary of basis used to measure certain financial assets at fair value on recurring basis (Details) (Fair Value, Measurements, Recurring, Common stock warrants, USD $)
Mar. 31, 2013
Dec. 31, 2012
Total
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Common stock warrant liability $ 4,574,655 $ 475,825
Quoted Prices in Active Markets for Identical Items (Level 1)
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Common stock warrant liability      
Significant Other Observable Inputs (Level 2)
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Common stock warrant liability      
Significant Unobservable Inputs (Level 3)
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Common stock warrant liability $ 4,574,655 $ 475,825