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)

v3.19.3
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, 2019
Dec. 31, 2018
Stock-Based Compensation [Abstract]    
Options, Outstanding - December 31, 2018 1,380,492  
Options, Awarded 100,769  
Options, Exercised (22,500)  
Options, Forfeited (147,127)  
Options, Outstanding - September 30, 2019 1,311,634 1,380,492
Options, Exercisable at September 30, 2019 960,165  
Options, Expected to vest September 30, 2019 1,268,303  
Weighted average exercise price per share, Outstanding - December 31, 2018 $ 7.56  
Weighted average exercise price per share, Awarded 2.69  
Weighted average exercise price per share, Exercised 3.61  
Weighted average exercise price per share, Forfeited 10.84  
Weighted average exercise price per share, Outstanding - September 30, 2019 6.89 $ 7.56
Weighted average exercise price per share, Exercisable at September 30, 2019 8.04  
Weighted average exercise price per share, Expected to vest September 30, 2019 $ 6.98  
Options, Outstanding - Weighted average remaining contractual term in years 3 years 10 months 17 days 4 years 2 months 5 days
Options, Exercisable - Weighted average remaining contractual term in years 3 years 3 months 18 days  
Options, Expected to vest - Weighted average remaining contractual term in years 3 years 9 months 29 days