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Stock-Based Compensation (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 97,000 $ 51,000 $ 135,000 $ 1,207,000
Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares originally reserved (in shares) 5,600,676        
Number of additional shares authorized (in shares) 1,200,000        
Number of shares available for grant (in shares)   2,117,233   2,117,233  
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   $ 0  
Incentive Plan | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost   $ 9,000   $ 9,000  
Unrecognized compensation cost, period of recognition (in years)       4 months 24 days  
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       $ 55,000  
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%   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%   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%   25.00%  
Deferred Plan | Deferred Compensation          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense       $ 0 $ 0