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, 2013
Sep. 30, 2012
Stock Incentive Plan [Member]
   
Shares Underlying Options    
Outstanding, beginning 707,940  
Granted 525,603  
Exercised     
Forfeited (13,394)  
Outstanding, ending 1,220,149  
Exercisable 507,612  
Weighted Average Exercise Price    
Outstanding, beginning $ 13.98  
Granted $ 2.06  
Exercised     
Forfeited $ 27.69  
Outstanding, ending $ 8.70  
Exercisable $ 17.60  
Weighted Average Remaining Contractual Term    
Outstanding 8 years 7 months 6 days  
Exercisable 7 years 9 months 18 days  
Aggregate Intrinsic Value    
Outstanding $ 8,603  
Exercisble 2,945  
Nonqualified [Member]
   
Shares Underlying Options    
Outstanding, beginning 598,507  
Granted 4,025,000 325,000
Exercised     
Forfeited (1,002)  
Outstanding, ending 4,622,505  
Weighted Average Exercise Price    
Outstanding, beginning $ 5.01  
Granted $ 1.36  
Exercised     
Forfeited $ 59.10  
Outstanding, ending $ 1.82  
Weighted Average Remaining Contractual Term    
Outstanding 4 years 7 months 6 days  
Aggregate Intrinsic Value    
Outstanding $ 2,334,500