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Stock Options (Details) (Employee Stock Option [Member], USD $)
 9 Months Ended
Sep. 30, 2014
Employee Stock Option [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options, Outstanding at January 1, 2014 (in shares) 3,048,069
Number of Options, Granted (in shares) 1,292,000
Number of Options, Exercised (in shares) (434,200)
Number of Options, Forfeited/Expired (in shares) (264,012)
Number of Options, Outstanding at September 30, 2014 (in shares) 3,641,857
Number of Options, Exercisable at September 30, 2014 (in shares) 1,336,732
Number of Options, Vested and Expected to Vest at September 30, 2014 (in shares) 3,641,857
Weighted - Average Exercise Price, Outstanding at January 1, 2014 (in dollars per share) $ 2.99
Weighted - Average Exercise Price, Granted (in dollars per shares) $ 2.79
Weighted - Average Exercise Price, Exercised (in dollars per share) $ 1.73
Weighted - Average Exercise Price, Forfeited/Expired (in dollars per share) $ 3.24
Weighted - Average Exercise Price, Outstanding at September 30, 2014 (in dollars per share) $ 3.05
Weighted - Average Exercise Price, Exercisable at September 30, 2014 (in dollars per share) $ 3.04
Weighted - Average Exercise Price, Vested and Expected to Vest at September 30, 2014 (in dollars per share) $ 3.04
Weighted - Average Remaining Contractual Term, Outstanding at September 30, 2014 (in years) 5 years 2 months 1 day
Weighted - Average Remaining Contractual Term, Exercisable at September 30, 2014 (in years) 3 years 10 months 13 days
Weighted - Average Remaining Contractual Term, Vested and Expected to Vest at September 30, 2014 (in years) 5 years 2 months 1 day
Aggregate Intrinsic Value, Outstanding at September 30, 2014 $ 818,961
Aggregate Intrinsic Value, Exercisable at September 30, 2014 422,436
Aggregate Intrinsic Value, Vested and Expected to Vest at September 30, 2014 $ 818,961