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)

v3.19.2
Stock-Based Compensation (Schedule of Changes in Number of Outstanding Stock Options Under Director Plan, Stock Plan and 2011 Incentive Plan) (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Stock-Based Compensation [Abstract]    
Options, Outstanding - December 31, 2018 1,380,492  
Options, Awarded 100,769  
Options, Exercised  
Options, Forfeited (147,127)  
Options, Outstanding - June 30, 2019 1,334,134 1,380,492
Options, Exercisable at June 30, 2019 982,665  
Options, Expected to vest June 30, 2019 1,334,134  
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  
Weighted average exercise price per share, Forfeited 10.84  
Weighted average exercise price per share, Outstanding - June 30, 2019 6.83 $ 7.56
Weighted average exercise price per share, Exercisable at June 30, 2019 7.94  
Weighted average exercise price per share, Expected to vest June 30, 2019 $ 6.83  
Options, Outstanding - Weighted average remaining contractual term (in years) 4 years 1 month 24 days 4 years 2 months 5 days
Options, Exercisable - Weighted average remaining contractual term (in years) 3 years 7 months 6 days  
Options, Expected to vest - Weighted average remaining contractual term (in years) 4 years 1 month 24 days