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Stock-based Compensation (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding      
Outstanding at beginning 86,089 82,590 73,865
Granted 58,396 8,974 12,925
Exercised (3,200) (2,450) (900)
Forfeited (2,970) (2,525) (50)
Expired (926) (530) (3,250)
Outstanding at ending 137,389 86,089 82,590
Exercisable at ending 83,354 72,165  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price      
Outstanding at beginning $ 31.40 $ 33.40 $ 32.2
Granted 25.80 30.60 92.40
Exercised 13.00 10.00 10.00
Forfeited 10.00
Expired 204.40
Outstanding at ending 28.00 31.40 $ 33.40
Exercisable at ending $ 31.00 $ 31.20  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Life      
Outstanding at beginning 4 years    
Granted 4 years 10 months 25 days 3 years 8 months 12 days 3 years 8 months 12 days
Outstanding at ending 3 years 10 months 25 days 4 years 4 months 24 days 5 years
Exercisable at ending 2 years 9 months 18 days 3 years 6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value      
Outstanding at beginning $ 9,662 [1]
Granted 34 [1]
Outstanding at ending
Exercisable at ending  
[1] The aggregate intrinsic value on the table was calculated based on the difference between the estimated fair value of the Company's stock and the exercise price of the underlying option. The estimated stock values used in the calculation was $0.59 and $0.72 per share for each of the years ended December 31, 2018 and 2017 respectively.