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 $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Stock Incentive Plan [Member]
   
Nonvested Shares Underlying Options    
Beginning balance 200,446  
Granted 652,100  
Vested (187,356)  
Forfeited (4,565) (7,308)
Ending balance 660,625  
Weighted Average Exercise Price    
Beginning balance $ 2.95  
Granted $ 2.28  
Vested $ 2.62  
Forfeited $ 2.12  
Ending balance $ 2.38  
Weighted Average Grant Date Fair Value    
Beginning balance $ 2.48  
Granted $ 1.91  
Vested $ 2.21  
Forfeited $ 1.77  
Ending balance $ 1.99