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Stock Options (Details) (Employee Stock Option [Member], USD $)
 6 Months Ended
Jun. 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) (345,114)
Number of Options, Forfeited/Expired (in shares) (83,563)
Number of Options, Outstanding at June 30, 2014 (in shares) 3,911,392
Number of Options, Exercisable at June 30, 2014 (in shares) 1,520,193
Number of Options, Vested and Expected to Vest at June 30, 2014 (in shares) 3,911,392
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) $ 1.58
Weighted - Average Exercise Price, Forfeited/Expired (in dollars per share) $ 2.78
Weighted - Average Exercise Price, Outstanding at June 30, 2014 (in dollars per share) $ 3.05
Weighted - Average Exercise Price, Exercisable at June 30, 2014 (in dollars per share) $ 3.06
Weighted - Average Exercise Price, Vested and Expected to Vest at June 30, 2014 (in dollars per share) $ 3.05
Weighted - Average Remaining Contractual Term, Outstanding at June 30, 2014 (in years) 5 years 2 months 12 days
Weighted - Average Remaining Contractual Term, Exercisable at June 30, 2014 (in years) 3 years 8 months 8 days
Weighted - Average Remaining Contractual Term, Vested and Expected to Vest at June 30, 2014 (in years) 3 years 8 months 8 days
Aggregate Intrinsic Value, Outstanding at June 30, 2014 $ 1,301,628
Aggregate Intrinsic Value, Exercisable at June 30, 2014 654,338
Aggregate Intrinsic Value, Vested and Expected to Vest at June 30, 2014 $ 1,301,628