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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 90 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share based compensation cost $ 1,489   $ 1,489  
Compensation expense recognized 190 $ 166    
Share-based compensation expense not yet recognized $ 869 $ 828 $ 869  
Plan 2010        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Capital shares reserved for future issuance (in shares)       400,000
Plan 2010 | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants during the period (in shares)     144,355  
Shares 67,689   67,689