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Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 12, 2018
Jun. 12, 2018
Jun. 19, 2017
Jun. 12, 2017
May 19, 2017
Mar. 27, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Jul. 31, 2015
Share price                     $ 0.59 $ 0.72  
Compensation cost not yet recognized                     $ 11,800    
Compensation cost not yet recognized, period for recognition                 3 years        
Stock based compensation expense             $ 204 $ 355 $ 675 $ 3,090 $ 3,412 $ 3,715  
Weighted average grant date fair value (in dollars per share)                 $ 30.20        
Weighted average grant date fair value (in dollars per share)                 $ 25.80   $ 30.60 $ 92.40  
RestrictedStockUnitsMember                          
Stock units granted (in shares)   3,146 3,000 641 895 2,000              
Weighted average grant date fair value (in dollars per share)   $ 36.40 $ 120.00 $ 13.00 $ 139.80 $ 167.00              
Equity Incentive Plan 2018 [Member]                          
Number of shares authorized 1,000,000           632,936   632,936        
Number of additional shares authorized 2,874,280                        
Common stock capital shares reserved for future issuance                     1,849,569    
Share price             $ 20.20   $ 20.20        
Compensation cost not yet recognized             $ 1,205   $ 1,205        
Equity Incentive Plan 2015 [Member]                          
Number of shares authorized                         2,000,000