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Stockholders' Equity - Options Outstanding and Exercisable (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
OPTIONS OUTSTANDING  
Number of Shares Outstanding (in shares) | shares 292,871
Weighted Average Remaining Contractual Life (in years) 7 years 3 months 18 days
Weighted Average Exercise Price (in dollars per share) $ 3.78
OPTIONS EXERCISABLE  
Number of Shares Exercisable (in shares) | shares 159,007
Weighted Average Remaining Contractual Life (in years) 5 years 9 months 18 days
Weighted Average Exercise Price (in dollars per share) $ 4.98
Exercise price, range one  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit (in dollars per share) 1.81
Range of Exercise Prices, upper limit (in dollars per share) $ 2.29
OPTIONS OUTSTANDING  
Number of Shares Outstanding (in shares) | shares 75,711
Weighted Average Remaining Contractual Life (in years) 9 years 4 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 1.81
OPTIONS EXERCISABLE  
Number of Shares Exercisable (in shares) | shares 0
Weighted Average Remaining Contractual Life (in years) 0 years
Weighted Average Exercise Price (in dollars per share) $ 0.00
Exercise price, range two  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit (in dollars per share) 2.30
Range of Exercise Prices, upper limit (in dollars per share) $ 3.25
OPTIONS OUTSTANDING  
Number of Shares Outstanding (in shares) | shares 76,157
Weighted Average Remaining Contractual Life (in years) 6 years 2 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 2.86
OPTIONS EXERCISABLE  
Number of Shares Exercisable (in shares) | shares 47,135
Weighted Average Remaining Contractual Life (in years) 4 years 8 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 2.98
Exercise price, range three  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit (in dollars per share) 3.26
Range of Exercise Prices, upper limit (in dollars per share) $ 4.00
OPTIONS OUTSTANDING  
Number of Shares Outstanding (in shares) | shares 74,165
Weighted Average Remaining Contractual Life (in years) 8 years 2 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 3.43
OPTIONS EXERCISABLE  
Number of Shares Exercisable (in shares) | shares 45,323
Weighted Average Remaining Contractual Life (in years) 8 years 2 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 3.43
Exercise price, range four  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit (in dollars per share) 4.01
Range of Exercise Prices, upper limit (in dollars per share) $ 15.08
OPTIONS OUTSTANDING  
Number of Shares Outstanding (in shares) | shares 66,838
Weighted Average Remaining Contractual Life (in years) 5 years
Weighted Average Exercise Price (in dollars per share) $ 7.46
OPTIONS EXERCISABLE  
Number of Shares Exercisable (in shares) | shares 66,549
Weighted Average Remaining Contractual Life (in years) 5 years
Weighted Average Exercise Price (in dollars per share) $ 7.46