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Stock-Based Compensation (Summary of Unvested Stock Options) (Details) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Shares:    
Unvested, beginning of period (in shares) 91,834  
Granted (in shares) 50,000  
Vested (in shares) (35,164)  
Canceled/Forfeited (in shares) (1,500)  
Unvested, end of period (in shares) 105,170  
Weighted Average Grant Date Fair Value:    
Unvested, weighted average grant date fair value, beginning of period (in USD per share) $ 14.19  
Granted, weighted average grant date fair value (in USD per share) 10.33  
Vested, weighted average grant date fair value (in USD per share) 12.88  
Canceled/Forfeited, weighted average grant date fair value (in USD per share) 16.79  
Unvested, weighted average grant date fair value, end of period (in USD per share) $ 12.75  
Unrecognized compensation cost related to awards, weighted average period for recognition 12 months  
Stock Options    
Weighted Average Grant Date Fair Value:    
Unrecognized compensation cost related to unvested options $ 1,008,953  
Unrecognized compensation cost related to awards, weighted average period for recognition 2 years  
Share-based compensation expense $ 265,258 $ 174,270