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Stock-Based Compensation and Stock Options (Details) - Stock Options
 1 Months Ended 3 Months Ended 12 Months Ended 30 Months Ended
Apr. 30, 2018
installment
$ / shares
shares
Nov. 01, 2017
$ / shares
shares
Mar. 31, 2016
$ / shares
shares
Sep. 30, 2015
$ / shares
shares
Jan. 31, 2012
$ / shares
shares
Mar. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2014
shares
Dec. 31, 2020
installment
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      
Unrecognized stock-based compensation expense | $           $ 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) | $ / shares       $ 8.07          
Options outstanding (in shares)           400,000      
Unrecognized stock-based compensation expense | $           $ 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) | $ / shares     $ 8.55            
Options vested and become exercisable annually (in shares)     37,500            
Options outstanding (in shares)           100,000      
Unrecognized stock-based compensation expense | $           $ 229,000      
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 11 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) | $ / shares   $ 6.95              
Options outstanding (in shares)           400,000      
Unrecognized stock-based compensation expense | $           $ 1,000,000      
Options vested and become exercisable quarterly (in shares)   50,000              
Options vested (in shares)           50,000      
Total stock-based compensation expense | $           $ 143,000      
Expected duration for recognition of stock based compensation expense (in years)           1 year 9 months 1 day      
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)    
Subsequent Event | 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                
Vesting installments | installment 12                
Scenario, Forecast | April 2018 Plan                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Vesting installments | installment                 11