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Share-Based Compensation - Plan (Details) - shares
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award      
Options granted (in shares) 0    
2008 Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Number of shares authorized under the plans (in shares) 333,333    
Options granted (in shares) 0 53,333  
Remaining shares available for grant under the plan (in shares) 42,650    
Contractual life of options 10 years    
2011 Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Number of shares authorized under the plans (in shares)     633,333
Options granted (in shares) 0 0  
Remaining shares available for grant under the plan (in shares) 233,028    
Contractual life of options 10 years    
2011 Plan | Non-employee Advisory Member of Board of Directors      
Share-based Compensation Arrangement by Share-based Payment Award      
Options granted (in shares) 6,000