Quarterly report pursuant to Section 13 or 15(d)

Stock options and warrants (Schedule of Nonvested Awards) (Details)

v2.4.0.8
Stock options and warrants (Schedule of Nonvested Awards) (Details) (Stock Incentive Plan [Member], USD $)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Stock Incentive Plan [Member]
   
Nonvested Shares Underlying Options    
Beginning balance 200,446  
Granted 727,100  
Vested (486,727)  
Forfeited (5,050) (7,308)
Ending balance 435,769  
Weighted Average Exercise Price    
Beginning balance $ 2.95  
Granted $ 2.29  
Vested $ 2.57  
Forfeited $ 2.15 $ 2.46
Ending balance $ 2.27  
Weighted Average Grant Date Fair Value    
Beginning balance $ 2.48  
Granted $ 1.89  
Vested $ 2.15  
Forfeited $ 1.77  
Ending balance $ 1.86