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Stock-based Compensation - Summary of plans (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 25, 2018
Feb. 28, 2019
Jan. 31, 2019
Feb. 28, 2018
Jan. 31, 2018
Apr. 30, 2017
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 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)             $ 26   $ (37)        
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             363       $ 363    
Period for recognizing unrecognized compensation cost                     1 year 5 months 1 day    
2018 LTIP | Stock Options                          
Stock-based Compensation                          
Stock based compensation expense (reversal of expense)             10   $ 10   $ 29 $ 29  
Period for recognizing unrecognized compensation cost                     1 year 4 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)             $ 63       $ 149    
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