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Stock-based Compensation (Details 3) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]      
Balance at beginning 6,818 14,395 22,772
Granted   3,787 [1] 5,895 [2]
Vested   (11,190) (14,118)
Forfeited   (179) (155)
Balance at ending   6,818 14,395
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Balance at beginning $ 19.60 $ 37.20 $ 15.20
Granted   32.40 139.00
Vested   51.20 35.00
Forfeited   139.80
Balance at ending   $ 19.60 $ 37.20
RestrictedStockUnitsMember      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]      
Balance at beginning 6,813    
Granted 6,187    
Vested (7,123)    
Forfeited    
Balance at ending 5,877 6,813  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Balance at beginning $ 19.60    
Granted 30.20    
Vested 22.00    
Forfeited    
Balance at ending $ 28.40 $ 19.60  
[1] 641 restricted stock units were granted on June 12, 2017 with a weighted average grant date fair value of $13.00 and 3,146 restricted stock units were granted on June 12, 2018 with a weighted average grant date fair value of $36.40
[2] 2,000 restricted stock units were granted on March 27, 2017 with a weighted average grant date fair value of $167.00, 895 restricted stock units were granted on May 19, 2017 with a weighted average grant date fair value of $139.80 and 3,000 restricted stock units were granted on June 19, 2017 with a weighted average grant date fair value of $120.00.