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Stock-based Compensation - Summary of plans (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 25, 2018
Feb. 28, 2019
Jan. 31, 2019
Feb. 28, 2018
Jan. 31, 2018
Apr. 30, 2017
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Jul. 24, 2018
Stock-based Compensation                            
Stock based compensation expense related to shares issued for services                     $ 52 $ 45    
2008 LTIP                            
Stock-based Compensation                            
Shares authorized to be granted under stock compensation plan                           2,000,000
2008 LTIP | Cash-settled restricted stock units                            
Stock-based Compensation                            
Stock based compensation expense (reversal of expense)             $ 10   $ 64          
2008 LTIP | Chief Executive Officer | Cash-settled restricted stock units | Two-year period                            
Stock-based Compensation                            
Restricted stock award (in shares)       97,195   129,270                
Vesting period of stock award       2 years   2 years                
2018 LTIP                            
Stock-based Compensation                            
Shares authorized to be granted under stock compensation plan                         1,293,109  
Contractual term of option awards 10 years                          
2018 LTIP | Restricted stock                            
Stock-based Compensation                            
Unrecognized compensation cost, restricted stock             439       $ 439      
Period for recognizing unrecognized compensation cost                     1 year 8 months 1 day      
2018 LTIP | Stock Options                            
Stock-based Compensation                            
Stock based compensation expense (reversal of expense)             10   $ 10   $ 19 $ 19    
Period for recognizing unrecognized compensation cost                     1 year 7 months 24 days      
Number of stock options granted (in shares)                     0 0    
2018 LTIP | Employees | Restricted stock                            
Stock-based Compensation                            
Stock based compensation expense (reversal of expense)             $ 64       $ 86      
2018 LTIP | Employees | Restricted stock | Two-year period                            
Stock-based Compensation                            
Restricted stock award (in shares)   428,796                        
Vesting period of stock award   2 years                        
2018 LTIP | Directors | Common Stock                            
Stock-based Compensation                            
Shares issued for services     42,168   18,906                  
Stock based compensation expense related to shares issued for services               $ 52   $ 45