Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Summary Of Share-Based Transactions ) (Details)

v3.8.0.1
Stock-Based Compensation (Summary Of Share-Based Transactions ) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of options, Exercised (25,000)   (88,943)
Stock Option [Member]      
Number of options, Oustanding 1,690,037    
Number of Options, Granted 483,260    
Number of options, Exercised (25,000)    
Number of options, Expired (20,000)    
Number of options, Cancelled (314,066)    
Number of options, Oustanding 1,814,231 1,690,037  
Weighted average exercise price, Outstanding $ 6.20    
Weighted average exercise price, Granted 2.37    
Weighted average exercise price, Exercised 3.10    
Weighted average exercise price, Expired 16.18    
Weighted average exercise price, Cancelled 4.97    
Weighted average exercise price, Outstanding $ 5.33 $ 6.20  
Weighted average remaining contractual term, Outstanding 7 years 1 month 6 days 7 years 3 months 18 days  
Aggregate intrinsic value, Outstanding $ 53,883    
Number of options, Exercisable 1,086,688    
Weighted average exercise price, Exercisable $ 6.50    
Weighted average remaining contractual term, Exercisable 6 years 2 months 12 days    
Aggregate intrinsic value, Exercisable $ 321