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Stock-Based Compensation - Shares Authorized Under Stock Option Plans by Exercise Price Range (Details)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Number of options, outstanding 589,125
Weighted average remaining contractual life, outstanding options 7 years 3 months 19 days
Number of options, exercisable 499,125
Weighted average remaining contractual life, exercisable options 6 years 10 months 25 days
Exercise Price Range One [Member]  
Exercise price range, lower limit | $ / shares $ 0.01
Exercise price range, upper limit | $ / shares $ 3.49
Number of options, outstanding 470,313
Weighted average remaining contractual life, outstanding options 8 years 4 months 24 days
Number of options, exercisable 380,313
Weighted average remaining contractual life, exercisable options 8 years 1 month 6 days
Exercise Price Range Two [Member]  
Exercise price range, lower limit | $ / shares $ 3.50
Exercise price range, upper limit | $ / shares $ 4.99
Number of options, outstanding 66,875
Weighted average remaining contractual life, outstanding options 4 years 3 months 19 days
Number of options, exercisable 66,875
Weighted average remaining contractual life, exercisable options 4 years 3 months 19 days
Exercise Price Range Three [Member]  
Exercise price range, lower limit | $ / shares $ 5.00
Exercise price range, upper limit | $ / shares $ 6.49
Number of options, outstanding
Weighted average remaining contractual life, outstanding options 0 years
Number of options, exercisable
Weighted average remaining contractual life, exercisable options 0 years
Exercise Price Range Four [Member]  
Exercise price range, lower limit | $ / shares $ 6.50
Exercise price range, upper limit | $ / shares $ 7.99
Number of options, outstanding 8,437
Weighted average remaining contractual life, outstanding options 1 year 9 months 18 days
Number of options, exercisable 8,437
Weighted average remaining contractual life, exercisable options 1 year 9 months 18 days
Exercise Price Range Five [Member]  
Exercise price range, lower limit | $ / shares $ 8.00
Exercise price range, upper limit | $ / shares $ 9.99
Number of options, outstanding 2,500
Weighted average remaining contractual life, outstanding options 1 year 4 months 24 days
Number of options, exercisable 2,500
Weighted average remaining contractual life, exercisable options 1 year 4 months 24 days
Exercise Price Range Six [Member]  
Exercise price range, lower limit | $ / shares $ 10.00
Exercise price range, upper limit | $ / shares $ 19.99
Number of options, outstanding 39,750
Weighted average remaining contractual life, outstanding options 1 year
Number of options, exercisable 39,750
Weighted average remaining contractual life, exercisable options 1 year
Exercise Price Range Seven [Member]  
Exercise price range, lower limit | $ / shares $ 20.00
Exercise price range, upper limit | $ / shares $ 24.99
Number of options, outstanding 1,250
Weighted average remaining contractual life, outstanding options 1 month 6 days
Number of options, exercisable 1,250
Weighted average remaining contractual life, exercisable options 1 month 6 days