Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan (Details)

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Equity Incentive Plan (Details) - Employee Stock Option [Member] - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Warrants, Outstanding 1,368,047  
Warrants, Granted 86,702  
Warrants, Exercised (58,203)  
Warrants, Forfeited/Expired/Exchanged (45,087)  
Warrants, Outstanding 1,351,459 1,368,047
Stock Options, Exercisable at June 30, 2015 441,252  
Outstanding at December 31, 2014 $ 6.41  
Weighted Average Exercise Price, Granted (in dollars per share) 8.15  
Weighted Average Exercise Price, Exercised (in dollars per share) 4.01  
Weighted Average Exercise Price, Forfeited/Expired/Exchanged (in dollars per share) 5.94  
Outstanding at June 30, 2015 6.64 $ 6.41
Weighted Average Exercise Price, Exercisable at June 30, 2015 (in dollars per share) $ 4.89  
Weighted Average Remaining Life, Outstanding (in years) 7 years 10 months 24 days 8 years 8 months 12 days
Weighted Average Remaining Life, Exercisable at June 30, 2015 (in years) 5 years 4 months 24 days