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 $)
3 Months Ended
Mar. 31, 2014
Stock Incentive Plan [Member]
 
Nonvested Shares Underlying Options  
Beginning balance 200,446
Granted 652,100
Vested (91,341)
Forfeited (3,667)
Ending balance 757,538
Weighted Average Exercise Price  
Beginning balance $ 2.95
Granted $ 2.28
Vested $ 3.04
Forfeited $ 2.04
Ending balance $ 2.36
Weighted Average Grant Date Fair Value  
Beginning balance $ 2.48
Granted $ 1.91
Vested $ 2.56
Forfeited $ 1.73
Ending balance $ 1.98