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Stock-Based Compensation and Stock Options (Details) - Stock Options - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Jun. 08, 2018
Jun. 30, 2018
May 31, 2018
Apr. 30, 2018
Nov. 01, 2017
Mar. 31, 2016
Sep. 30, 2015
Jan. 31, 2012
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2014
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)                   $ 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 50,000    
Unrecognized stock-based compensation expense   $ 0   $ 0             $ 0 $ 0    
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)                 $ 8.07          
Options outstanding (in shares)   400,000   400,000             400,000 400,000    
Unrecognized stock-based compensation expense   $ 0   $ 0             $ 0 $ 0    
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)               $ 8.55            
Options vested and become exercisable annually (in shares)               37,500            
Options outstanding (in shares)   100,000   100,000             100,000 100,000    
Unrecognized stock-based compensation expense   $ 199,000   $ 199,000             $ 199,000 $ 199,000    
Options vested (in shares)   50,000                        
Total stock-based compensation expense                     $ 30,000      
Expected duration for recognition of stock based compensation expense (in years)                       1 year 8 months 7 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)             $ 6.95              
Options outstanding (in shares)   400,000   400,000             400,000 400,000    
Unrecognized stock-based compensation expense   $ 860,000   $ 860,000             $ 860,000 $ 860,000    
Options vested and become exercisable quarterly (in shares)             50,000              
Options vested (in shares)   100,000                        
Total stock-based compensation expense                     $ 143,000 $ 287,000    
Expected duration for recognition of stock based compensation expense (in years)                       18 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)           $ 10.50                
Options outstanding (in shares)   50,000   50,000             50,000 50,000    
Unrecognized stock-based compensation expense   $ 201,000   $ 201,000             $ 201,000 $ 201,000    
Options vested (in shares)   8,333                        
Total stock-based compensation expense                     $ 40,000 $ 40,000    
Expected duration for recognition of stock based compensation expense (in years)                       2 years 6 months    
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)         $ 14.70                  
Options vested and become exercisable annually (in shares)         12,500                  
Options outstanding (in shares)   50,000   50,000             50,000 50,000    
Unrecognized stock-based compensation expense   $ 347,000   $ 347,000             $ 347,000 $ 347,000    
Options vested (in shares)                       0    
Total stock-based compensation expense                     $ 11,000 $ 11,000    
Expected duration for recognition of stock based compensation expense (in years)                       3 years 10 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                         $ 19,000  
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)       $ 17.75                    
Options outstanding (in shares)   100,000   100,000             100,000 100,000    
Total stock-based compensation expense                     $ 122,000 $ 122,000    
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)       $ 16.65                    
Options vested and become exercisable annually (in shares)       12,500                    
Options outstanding (in shares)   50,000   50,000             50,000 50,000    
Unrecognized stock-based compensation expense   $ 403,000   $ 403,000             $ 403,000 $ 403,000    
Options vested (in shares)                       0    
Total stock-based compensation expense                     $ 2,000 $ 2,000    
Expected duration for recognition of stock based compensation expense (in years)                       3 years 11 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 | Subsequent Event | 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