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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended 93 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted (in shares) 0 0  
Award accelerated service period 1 year    
Restricted Stock and Restricted Stock Units Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 6.8 $ 6.8  
Unrecognized compensation cost, weighted average period 1 year 8 months    
Minimum | Stock option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options previously granted vesting period 3 years    
Options previously granted expiration period 7 years    
Maximum | Stock option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options previously granted vesting period 5 years    
Options previously granted expiration period 10 years    
2017 Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant (in shares)     1,675,000