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Stockholders' Equity (Details 1) (USD $)
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Number of option outstanding 1,214,749 946,281
Options outstanding, Weighted average remaining contractual life (Years) 7 years 7 months 28 days  
Options outstanding, Weighted average exercise price $ 3.13 $ 6.19
Number of option exerciseable 899,692  
Options exercisable, Weighted average remaining contractual life (Years) 7 years 2 months 16 days  
Options exercisable, Weighted average exercise price $ 3.05