Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Schedule Of Changes In Number Of Outstanding Stock Options Under Director Plan, Stock Plan And 2011 Incentive Plan) (Details)

v3.8.0.1
Stock-Based Compensation (Schedule Of Changes In Number Of Outstanding Stock Options Under Director Plan, Stock Plan And 2011 Incentive Plan) (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Stock-Based Compensation [Abstract]    
Options, Outstanding 922,930  
Options, Awarded 259,686  
Options, Exercised  
Options, Forfeited (37,199)  
Options, Outstanding 1,145,417 922,930
Options, Exercisable 669,186  
Options, Expected to vest 1,145,417  
Weighted average exercise price per share, Outstanding $ 10.10  
Weighted average exercise price per share, Awarded 4.42  
Weighted average exercise price per share, Exercised  
Weighted average exercise price per share, Forfeited 11.57  
Weighted average exercise price per share, Outstanding 8.76 $ 10.10
Weighted average exercise price per share, Exercisable 10.50  
Weighted average exercise price per share, Expected to vest $ 8.76  
Options, Outstanding - Weighted average remaining contractual term (in years) 4 years 8 months 27 days 4 years 10 months 24 days
Options, Exercisable - Weighted average remaining contractual term (in years) 3 years 11 months 19 days  
Options, Expected to vest - Weighted average remaining contractual term (in years) 4 years 8 months 27 days