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Stock-based Compensation - Options Outstanding and Exercisable (Details) - 2008 LTIP - Stock Options
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Outstanding  
Number Outstanding | shares 455,000
Weighted Average Remaining Contractual Life 6 years 3 months 29 days
Weighted Average Exercise Price | $ / shares $ 1.67
Exercisable  
Number Outstanding | shares 275,000
Weighted Average Exercise Price | $ / shares $ 1.70
Grant Date January 21, 2010  
Outstanding  
Number Outstanding | shares 5,000
Weighted Average Remaining Contractual Life 3 months 18 days
Weighted Average Exercise Price | $ / shares $ 6.00
Exercisable  
Number Outstanding | shares 5,000
Weighted Average Exercise Price | $ / shares $ 6.00
Grant Date February 24, 2016  
Outstanding  
Number Outstanding | shares 450,000
Weighted Average Remaining Contractual Life 6 years 4 months 24 days
Weighted Average Exercise Price | $ / shares $ 1.62
Exercisable  
Number Outstanding | shares 270,000
Weighted Average Exercise Price | $ / shares $ 1.62