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)

v3.21.2
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, 2021
Dec. 31, 2020
Stock-Based Compensation [Abstract]    
Options, Outstanding – December 31, 2020 1,173,190  
Options, Awarded  
Options, Exercised  
Options, Forfeited (103,265)  
Options, Outstanding – June 30, 2021 1,069,925 1,173,190
Options, Exercisable at June 30, 2021 904,263  
Options, Expected to vest June 30, 2021 1,069,925  
Weighted average exercise price per share, Outstanding – December 31, 2020 $ 6.52  
Weighted average exercise price per share, Awarded  
Weighted average exercise price per share, Exercised  
Weighted average exercise price per share, Forfeited 12.43  
Weighted average exercise price per share, Outstanding – June 30, 2021 5.95 $ 6.52
Weighted average exercise price per share, Exercisable at June 30, 2021 6.20  
Weighted average exercise price per share, Expected to vest June 30, 2021 $ 5.95  
Weighted average remaining contractual term in years, Outstanding 3 years 1 month 20 days 3 years 4 months 6 days
Weighted average remaining contractual term in years, Exercisable 2 years 8 months 19 days  
Weighted average remaining contractual term in years, Options, Expected to vest 3 years 1 month 20 days