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)

v3.21.1
Stock-Based Compensation (Schedule of Changes in Number of Outstanding Stock Options Under Director Plan, Stock Plan and 2011 Incentive Plan) (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Stock-Based Compensation [Abstract]    
Options, Outstanding - December 31, 2020 1,173,190  
Options, Awarded  
Options, Exercised  
Options, Forfeited (59,365)  
Options, Outstanding - March 31, 2021 1,113,825 1,173,190
Options, Exercisable at March 31, 2021 885,855  
Options, Expected to vest March 31, 2021 1,113,825  
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 12.97  
Weighted average exercise price per share, Outstanding - March 31, 2021 6.18 $ 6.52
Weighted average exercise price per share, Exercisable at March 31, 2021 6.55  
Weighted average exercise price per share, Expected to vest March 31, 2021 $ 6.18  
Options, Outstanding - Weighted average remaining contractual term in years 3 years 3 months 7 days 3 years 4 months 6 days
Options, Exercisable - Weighted average remaining contractual term in years 2 years 7 months 10 days  
Options, Expected to vest - Weighted average remaining contractual term in years 3 years 3 months 7 days