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Stock-Based Compensation (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ (59,000) $ (10,000)
Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares originally reserved (in shares) 4,400,676  
Number of shares available for grant (in shares) 593,198  
Incentive Plan | Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 10 years  
Award service period (in years) 4 years  
Unrecognized compensation costs $ 0  
Incentive Plan | Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 858,000  
Unrecognized compensation cost, period of recognition (in years) 2 years 9 months  
Incentive Plan | Restricted Stock Units (RSUs) | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 2 years  
Incentive Plan | Restricted Stock Units (RSUs) | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 4 years  
Incentive Plan | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of stock vested $ 49,000  
Incentive Plan | Second Anniversary of Award Date | Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percent of options vesting 50.00%  
Incentive Plan | Third Anniversary of Award Date | Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percent of options vesting 25.00%  
Incentive Plan | Fourth Anniversary of Award Date | Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percent of options vesting 25.00%  
Deferred Plan | Deferred Compensation    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 0 $ 0