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Stock-based Compensation - Restricted Stock (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2018
Jan. 31, 2018
Apr. 30, 2017
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Stock-based compensation            
Stock based compensation expense related to shares issued for services         $ 45 $ 53
Common Stock            
Stock-based compensation            
Shares issued for services         18,906 30,002
Stock based compensation expense related to shares issued for services           $ 1
2008 LTIP | Common Stock | Directors            
Stock-based compensation            
Shares issued for services   18,906 30,002      
Stock based compensation expense related to shares issued for services         $ 45 53
2008 LTIP | Restricted stock | Chief Executive Officer            
Stock-based compensation            
Restricted stock award (in shares)       120,483    
Stock based compensation expense (reversal of expense)         36 105
Unrecognized compensation cost, restricted stock         $ 3  
2008 LTIP | Restricted stock | Chief Executive Officer | Expected Recognition Period: 3 months            
Stock-based compensation            
Period for recognizing unrecognized compensation cost         3 months  
2008 LTIP | Restricted stock | Two-year period | Chief Executive Officer            
Stock-based compensation            
Restricted stock award (in shares)       100,000    
Vesting period of stock award       2 years    
2008 LTIP | Restricted stock | Three-year period | Chief Executive Officer            
Stock-based compensation            
Restricted stock award (in shares)       20,483    
Vesting period of stock award       3 years    
2008 LTIP | Cash-settled restricted stock units | Chief Executive Officer            
Stock-based compensation            
Restricted stock award (in shares) 97,195   129,270      
Vesting period of stock award     2 years      
Stock based compensation expense (reversal of expense)         $ 73 $ 102