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Share-Based Compensation - Plans (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
May 24, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares)     2,350,000    
2008 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized under the plans (in shares) 333,333   333,333    
Options granted (in shares) 0 0 0 153,332  
Remaining shares available for grant under the plan (in shares) 106,142   106,142    
Contractual life of options     10 years    
2011 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized under the plans (in shares)         3,650,000
Options granted (in shares) 275,000   2,350,000    
Remaining shares available for grant under the plan (in shares) 752,395   752,395    
Contractual life of options     10 years    
2011 Plan | Non-employee Board of Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares) 416,000 0 435,800 166,665