Annual report pursuant to Section 13 and 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 $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Incentive Plan [Member]
       
Shares Underlying Options        
Outstanding, beginning 707,940      
Granted 525,603 540,378 52,267  
Exercised           
Forfeited (15,278) (47,759) (20,912) (1,523)
Outstanding, ending 1,218,265 707,940    
Exercisable 1,017,819      
Weighted Average Exercise Price        
Outstanding, beginning $ 13.98      
Granted $ 2.06 $ 2.29 $ 19.14  
Exercised         
Forfeited $ 24.68 $ 61.79 $ 52.50 $ 79.50
Outstanding, ending $ 8.70 $ 13.98    
Exercisable $ 9.84      
Weighted Average Remaining Contractual Term        
Outstanding 8 years 4 months 24 days      
Exercisable 8 years 2 months 12 days      
Aggregate Intrinsic Value        
Outstanding $ 85,000      
Exercisble 61,000      
Nonqualified [Member]
       
Shares Underlying Options        
Outstanding, beginning 598,507      
Granted 4,025,000      
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 3 months 18 days      
Aggregate Intrinsic Value        
Outstanding $ 3,139,500