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Stock Options (Details) (USD $)
 3 Months Ended
Mar. 31, 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) (75,500)
Number of Shares, Forfeited/Expired (in shares) (47,500)
Number of Shares, Outstanding at March 31, 2013 (in shares) 3,877,079
Number of Shares, Exercisable at March 31, 2013 (in shares) 1,338,057
Number of Shares, Vested and expected to vest at March 31, 2013 (in shares) 3,877,079
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) $ 1.72
Weighted - Average Exercise Price, Forfeited/Expired (in dollars per share) $ 3.99
Weighted - Average Exercise Price, Outstanding at March 31, 2013 (in dollars per share) $ 2.93
Weighted - Average Exercise Price, Exercisable at March 31, 2013 (in dollars per share) $ 2.79
Weighted - Average Exercise Price,Vested and expected to vest at March 31, 2013 (in dollars per share) $ 2.93
Weighted - Average Remaining Contractual Term, Outstanding at March 31, 2013 (in years) 4 years 10 months 6 days
Weighted - Average Remaining Contractual Term, Exercisable at March 31, 2013 (in years) 2 years 3 months
Weighted - Average Remaining Contractual Term, Vested and expected to vest at March 31, 2013 (in years) 4 years 10 months 6 days
Aggregate Intrinsic Value, Outstanding at March 31, 2013 $ 2,379,411
Aggregate Intrinsic Value, Exercisable at March 31, 2013 1,150,020
Aggregate Intrinsic Value, Vested and expected to vest at March 31, 2013 $ 2,379,411