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Stock-Based Compensation and Stock Options (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
shares
May 31, 2019
installment
$ / shares
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
Jun. 30, 2019
USD ($)
shares
Mar. 31, 2019
shares
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award                              
Options exercised (in shares)                   250,000          
January 2012 Plan | Stock Options                              
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)                     50,000       25,000
Options forfeited (in shares)                             25,000
September 2015 Plan | Stock Options                              
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 vested and become exercisable quarterly (in shares)               50,000              
Options vested (in shares) 400,000                            
Options outstanding (in shares) 400,000                 400,000   400,000      
March 2016 Plan | Stock Options                              
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 exercised (in shares)                     50,000        
Shares issued upon exercise of options (in shares) 4,000                 4,000   4,000      
October 2017 Plan | Stock Options                              
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 vested and become exercisable quarterly (in shares)           50,000                  
Options vested (in shares) 50,000                            
Total stock-based compensation expense | $                   $ 143   $ 287      
Options exercised (in shares)                       250,000      
Options outstanding (in shares) 150,000                 150,000   150,000      
Unrecognized stock-based compensation expense | $ $ 287                 $ 287   $ 287      
Expected duration for recognition of stock based compensation expense (in years)                       6 months      
April 2018 Plan | Stock Options                              
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 canceled (in shares)                   50,000          
Total stock-based compensation expense | $                   $ 34          
Number of installments | installment         12                    
May 2018 Plan | Stock Options                              
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 vested (in shares) 12,500                            
Total stock-based compensation expense | $                   $ 22   $ 45      
Options outstanding (in shares) 50,000                 50,000   50,000      
Unrecognized stock-based compensation expense | $ $ 257                 $ 257   $ 257      
Expected duration for recognition of stock based compensation expense (in years)                       2 years 10 months 15 days      
May 2019 Plan | Stock Options                              
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   $ 19.28                          
Options vested (in shares) 10,000                            
Total stock-based compensation expense | $                   146          
Unrecognized stock-based compensation expense | $ $ 732                 732   $ 732      
Expected duration for recognition of stock based compensation expense (in years)                       3 years 10 months 21 days      
Number of installments | installment   3                          
Executive Officer | March 2016 Plan | Stock Options                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Options canceled (in shares)                           12,500  
Options forfeited (in shares)                         50,000 37,500  
Total stock-based compensation expense | $                         $ (59) $ (19)  
Employee | June 2018 Plan | Stock Options                              
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 vested (in shares) 12,500                            
Total stock-based compensation expense | $                   $ 7   $ 32      
Options outstanding (in shares) 50,000                 50,000   50,000      
Unrecognized stock-based compensation expense | $ $ 247                 $ 247   $ 247      
Expected duration for recognition of stock based compensation expense (in years)                       2 years 11 months 23 days      
August 2019 | May 2019 Plan | Stock Options                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Options vested and exercisable in future periods (in shares)   15,000                          
May 20, 2021 | May 2019 Plan | Stock Options                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Options vested and exercisable in future periods (in shares)   75,000