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Stockholders' Equity - Issuance of Common Stock (Details)
$ in Thousands
12 Months Ended
Jul. 02, 2018
director
shares
Mar. 15, 2018
employee
shares
Jul. 03, 2017
director
shares
May 17, 2016
director
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
employee
shares
Dec. 31, 2016
USD ($)
shares
May 23, 2018
USD ($)
May 25, 2017
USD ($)
Share-based compensation                  
Stock compensation expense         $ 71 $ 76 $ 131    
Date of issue | Restricted Stock                  
Share-based compensation                  
Vesting percentage       25.00%          
August 17, 2016 | Restricted Stock                  
Share-based compensation                  
Vesting percentage       25.00%          
November 17, 2016 | Restricted Stock                  
Share-based compensation                  
Vesting percentage       25.00%          
February 17, 2017 | Restricted Stock                  
Share-based compensation                  
Vesting percentage       25.00%          
Directors | Restricted Stock                  
Share-based compensation                  
Fair value of equity grant award approved for each director               $ 50,000 $ 50,000
Number of restricted stock awards granted | shares 2,778   5,334 8,919 2,778 5,334 8,919    
Number of directors granted restricted stock awards | director 1   2 3          
Number of directors who elected to receive cash in lieu of the stock | director 3   4            
Stock compensation expense         $ 100 $ 100 $ 100    
Officers | Restricted Stock                  
Share-based compensation                  
Number of restricted stock awards granted | shares         9,956        
Issuance of common stock for officer compensation, net of tax withholding (in shares) | shares   9,956              
Number of directors granted restricted stock awards | employee   4              
Stock compensation expense         $ 200        
Percentage of total discretionary cash incentive award elected to be received in shares of Company stock           50.00%      
Number of grantees who elected to receive a portion of total discretionary cash incentive award in shares of company stock | employee           4