Share-Based Compensation - Employee Share-Based Compensation Plans (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)			153,332
2008 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)	100,000	667	153,332	40,000
Remaining shares available for grant under the plan (in shares)	31,659		31,659
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)	0	30,000	0	30,000
Remaining shares available for grant under the plan (in shares)	243,693		243,693
Non-employee Members Board of Directors | 2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)			166,665	2,778