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Stock-Based Compensation and Stock Options (Details) - Stock Options
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
shares
Jun. 30, 2018
$ / shares
shares
May 31, 2018
$ / shares
shares
Apr. 30, 2018
installment
$ / shares
shares
Oct. 31, 2017
$ / shares
shares
Mar. 31, 2016
$ / shares
shares
Sep. 30, 2015
$ / shares
shares
Jan. 31, 2012
$ / shares
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2014
shares
January 2012 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Employee options granted to purchase shares of common stock (in shares)               100,000        
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares               $ 28.98        
Options vested and become exercisable annually (in shares)               25,000        
Options canceled (in shares)                       25,000
Options forfeited (in shares)                       25,000
Options outstanding (in shares) 50,000               50,000 50,000    
Options vested (in shares) 50,000                      
September 2015 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Employee options granted to purchase shares of common stock (in shares)             400,000          
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares             $ 8.07          
Options outstanding (in shares) 400,000               400,000 400,000    
Options vested and become exercisable quarterly (in shares)             50,000          
Options vested (in shares) 400,000                      
March 2016 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Employee options granted to purchase shares of common stock (in shares)           150,000            
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares           $ 8.55            
Options vested and become exercisable annually (in shares)           37,500            
Options outstanding (in shares) 100,000               100,000 100,000    
Options vested (in shares) 50,000                      
Total stock-based compensation expense | $                 $ 30 $ 89    
Unrecognized stock-based compensation expense | $ $ 170               $ 170 $ 170    
Expected duration for recognition of stock based compensation expense (in years)                   1 year 4 months 24 days    
October 2017 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Employee options granted to purchase shares of common stock (in shares)         400,000              
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares         $ 6.95              
Options outstanding (in shares) 400,000               400,000 400,000    
Options vested and become exercisable quarterly (in shares)         50,000              
Options vested (in shares) 150,000                      
Total stock-based compensation expense | $                 $ 143 $ 430    
Unrecognized stock-based compensation expense | $ $ 717               $ 717 $ 717    
Expected duration for recognition of stock based compensation expense (in years)                   15 months    
April 2018 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Employee options granted to purchase shares of common stock (in shares)       50,000                
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares       $ 10.50                
Options outstanding (in shares) 50,000               50,000 50,000    
Options vested (in shares) 12,500                      
Total stock-based compensation expense | $                 $ 20 $ 60    
Unrecognized stock-based compensation expense | $ $ 181               $ 181 $ 181    
Expected duration for recognition of stock based compensation expense (in years)                   2 years 3 months    
Number of installments | installment       12                
May 2018 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Employee options granted to purchase shares of common stock (in shares)     50,000                  
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares     $ 14.70                  
Options vested and become exercisable annually (in shares)     12,500                  
Options outstanding (in shares) 50,000               50,000 50,000    
Options vested (in shares)                   0    
Total stock-based compensation expense | $                 $ 22 $ 34    
Unrecognized stock-based compensation expense | $ $ 324               $ 324 $ 324    
Expected duration for recognition of stock based compensation expense (in years)                   3 years 7 months 15 days    
Executive Officer | March 2016 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Options canceled (in shares)                     12,500  
Options forfeited (in shares)                     37,500  
Total stock-based compensation expense | $                     $ 19  
Nonemployee | June 2018 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Employee options granted to purchase shares of common stock (in shares)   100,000                    
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares   $ 17.75                    
Options forfeited (in shares)                   80,000    
Options outstanding (in shares) 20,000               20,000 20,000    
Total stock-based compensation expense | $                 $ 122 $ 122    
Employee | June 2018 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Employee options granted to purchase shares of common stock (in shares)   50,000                    
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares   $ 16.65                    
Options vested and become exercisable annually (in shares)   12,500                    
Options outstanding (in shares) 50,000               50,000 50,000    
Options vested (in shares)                   0    
Total stock-based compensation expense | $                 $ 25 $ 28    
Unrecognized stock-based compensation expense | $ $ 377               $ 377 $ 377    
Expected duration for recognition of stock based compensation expense (in years)                   3 years 8 months 23 days    
Tranche One | Nonemployee | June 2018 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Options vested (in shares)   20,000                    
Tranche Two | Nonemployee | June 2018 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Options vested (in shares)   30,000                    
Tranche Three | Nonemployee | June 2018 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award                        
Options vested (in shares)   50,000