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Stock Based Compensation - Narrative (Details)
3 Months Ended 9 Months Ended
May 31, 2018
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
shares
May 28, 2014
event
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Outstanding number of shares underlying options (in shares)   1,183,000   1,183,000   1,202,000  
Options granted (in shares)       0      
Unrecognized stock-based compensation expense | $   $ 0   $ 0      
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense | $   $ 0 $ 0 $ 0 $ 18,000    
Restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares outstanding (in shares)   113,000   113,000   341,000  
Stock-based compensation expense | $   $ 2,000 $ 15,000 $ 14,000 $ 45,000    
Equity Incentive Plan, 2014              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for issuance (in shares)   3,429,000   3,429,000     4,400,000
Additional shares available for issuance (in shares) 3,000,000            
Equity Incentive Plan, 2014 | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of events to occur to permit granting (or more) | event             1
Stock Incentive Plan, 2007 | Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for issuance (in shares)   0   0      
Outstanding number of shares underlying options (in shares)   1,183,000   1,183,000      
Stock Incentive Plan, 2007 | Restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares outstanding (in shares)   113,000   113,000