Quarterly report pursuant to Section 13 or 15(d)

Stock options and warrants (Schedule of Award Activity) (Details)

v3.3.0.814
Stock options and warrants (Schedule of Award Activity) (Details) - USD ($)
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Shares Underlying Options    
Exercised   (39,079)
Weighted Average Exercise Price    
Exercised   $ 2.09
Stock Incentive Plan [Member]    
Shares Underlying Options    
Outstanding, beginning 1,854,258  
Granted 1,094,500  
Exercised  
Forfeited (217,427) (41,561)
Outstanding, ending 2,731,331  
Exercisable 1,793,897  
Weighted Average Exercise Price    
Outstanding, beginning $ 5.79  
Granted $ 1.89  
Exercised  
Forfeited $ 3.64  
Outstanding, ending 4.40  
Exercisable $ 5.67  
Weighted Average Remaining Contractual Term    
Outstanding 8 years 1 month 6 days  
Outstanding and exercisable 7 years 6 months  
Aggregate Intrinsic Value    
Outstanding  
Outstanding and exercisable  
Nonqualified [Member]    
Shares Underlying Options    
Outstanding, beginning 3,455,935  
Granted  
Exercised  
Forfeited  
Outstanding, ending 3,455,935  
Weighted Average Exercise Price    
Outstanding, beginning $ 1.93  
Granted  
Exercised  
Forfeited  
Outstanding, ending $ 1.93  
Weighted Average Remaining Contractual Term    
Outstanding and exercisable 2 years 6 months  
Aggregate Intrinsic Value    
Outstanding