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Stock Options (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Number of Shares, Outstanding at January 1, 2013 (in shares) 2,986,057
Number of Shares, Granted (in shares) 1,014,022
Number of Shares, Exercised (in shares) (201,500)
Number of Shares, Forfeited/Expired (in shares) (433,444)
Number of Shares, Outstanding at September 30, 2013 (in shares) 3,365,135
Number of Shares, Exercisable at September 30, 2013 (in shares) 1,100,057
Number of Shares, Vested and expected to vest at September 30, 2013 (in shares) 3,365,135
Weighted - Average Exercise Price, Outstanding at January 1, 2013 (in dollars per share) $ 2.75
Weighted - Average Exercise Price, Granted (in dollars per shares) $ 3.39
Weighted - Average Exercise Price, Exercised (in dollars per share) $ 0.96
Weighted - Average Exercise Price, Forfeited/Expired (in dollars per share) $ 2.99
Weighted - Average Exercise Price, Outstanding at September 30, 2013 (in dollars per share) $ 3.02
Weighted - Average Exercise Price, Exercisable at September 30, 2013 (in dollars per share) $ 3.00
Weighted - Average Exercise Price,Vested and expected to vest at September 30, 2013 (in dollars per share) $ 3.02
Weighted - Average Remaining Contractual Term, Outstanding at September 30, 2013 (in years) 4 years 5 months 26 days
Weighted - Average Remaining Contractual Term, Exercisable at September 30, 2013 (in years) 1 year 10 months 13 days
Weighted - Average Remaining Contractual Term, Vested and expected to vest at September 30, 2013 (in years) 4 years 5 months 26 days
Aggregate Intrinsic Value, Outstanding at September 30, 2013 $ 381,872
Aggregate Intrinsic Value, Exercisable at September 30, 2013 352,722
Aggregate Intrinsic Value, Vested and expected to vest at September 30, 2013 $ 381,872