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Stock Options (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
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) 100,000
Number of Options, Exercised (in shares) (154,000)
Number of Options, Forfeited/Expired (in shares) (78,239)
Number of Options, Outstanding at March 31, 2014 (in shares) 2,915,830
Number of Options, Exercisable at March 31, 2014 (in shares) 843,057
Number of Options, Vested and Expected to Vest at March 31, 2014 (in shares) 2,915,830
Weighted - Average Exercise Price, Outstanding at January 1, 2014 (in dollars per share) $ 2.99
Weighted - Average Exercise Price, Granted (in dollars per shares) $ 3.21
Weighted - Average Exercise Price, Exercised (in dollars per share) $ 2.59
Weighted - Average Exercise Price, Forfeited/Expired (in dollars per share) $ 2.76
Weighted - Average Exercise Price, Outstanding at March 31, 2014 (in dollars per share) $ 3.03
Weighted - Average Exercise Price, Exercisable at March 31, 2014 (in dollars per share) $ 3.03
Weighted - Average Exercise Price, Vested and Expected to Vest at March 31, 2014 (in dollars per share) $ 3.03
Weighted - Average Remaining Contractual Term, Outstanding at March 31, 2014 (in years) 4 years 7 months 2 days
Weighted - Average Remaining Contractual Term, Exercisable at March 31, 2014 (in years) 2 years 6 months 14 days
Weighted - Average Remaining Contractual Term, Vested and Expected to Vest at March 31, 2014 (in years) 4 years 7 months 2 days
Aggregate Intrinsic Value, Outstanding at March 31, 2014 $ 793,777
Aggregate Intrinsic Value, Exercisable at March 31, 2014 466,027
Aggregate Intrinsic Value, Vested and Expected to Vest at March 31, 2014 $ 793,777