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Summary of Significant Accounting Policies (Details 2) (Common stock warrant, USD $)
12 Months Ended
Dec. 31, 2012
Assumptions used to calculate fair value of common stock warrant liability using Monte-Carlo simulation on a Black-Scholes lattice model  
Volatility (as a percent) 80.00%
Stock Price (in dollars per share) $ 7.17
Dividend Yield (as a percent) 0.00%
Minimum
 
Assumptions used to calculate fair value of common stock warrant liability using Monte-Carlo simulation on a Black-Scholes lattice model  
Exercise Price (in dollars per share) $ 4
Term 8 years 1 month 6 days
Risk-Free Rate (as a percent) 1.60%
Maximum
 
Assumptions used to calculate fair value of common stock warrant liability using Monte-Carlo simulation on a Black-Scholes lattice model  
Exercise Price (in dollars per share) $ 5
Term 9 years
Risk-Free Rate (as a percent) 1.80%