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Stock-based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 01, 2018
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options to purchase, Granted (in shares)     526,500  
Options cancelled to purchase common stock     931,550  
Options, Exercised     173,130  
Stock-based compensation expense     $ 146 $ 132
Options [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense   $ 100 100  
Employee Service-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options   $ 600 $ 600  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 7 months 6 days  
Restricted Stock [Member] | David Ludwig And Tom Ludwig [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Restricted common stock granted 600,000      
Shares restriction term of service 5 years      
Employees [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options to purchase, Granted (in shares)     441,500  
Employees [Member] | NLEX [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options to purchase, Granted (in shares) 300,000      
Options, Exercised 173,130      
Non-Employee Directors [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options to purchase, Granted (in shares)     85,000