Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Stock options and warrants (Schedule of Award Activity) (Details) (USD $)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Shares Underlying Options    
Exercised (39,079)  
Stock Incentive Plan [Member]
   
Shares Underlying Options    
Outstanding, beginning 1,218,265  
Granted 727,100  
Exercised (39,079)  
Forfeited (41,561) (13,394)
Outstanding, ending 1,864,725  
Exercisable 1,428,956  
Weighted Average Exercise Price    
Outstanding, beginning $ 8.70  
Granted $ 2.29  
Exercised $ 2.09  
Forfeited $ 30.01  
Outstanding, ending $ 5.87  
Exercisable $ 6.96  
Weighted Average Remaining Contractual Term    
Outstanding and exercisable 8 years 4 months 24 days  
Outstanding and exercisable 8 years 1 month 6 days  
Aggregate Intrinsic Value    
Outstanding     
Outstanding and exercisable     
Nonqualified [Member]
   
Shares Underlying Options    
Outstanding, beginning 4,622,505  
Granted     
Exercised (1,161,570)  
Forfeited (5,000)  
Outstanding, ending 3,455,935  
Weighted Average Exercise Price    
Outstanding, beginning $ 1.82  
Granted     
Exercised $ 1.36  
Forfeited $ 30.00  
Outstanding, ending $ 1.93  
Weighted Average Remaining Contractual Term    
Outstanding and exercisable 3 years 6 months  
Aggregate Intrinsic Value    
Outstanding $ 859,029