Share-Based Compensation - Employee Share-Based Compensation Plans (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 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)			153,332	40,000
Remaining shares available for grant under the plan (in shares)	42,124		42,124
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)	0	16,667	166,665	46,667
Remaining shares available for grant under the plan (in shares)	243,693		243,693
2011 Plan | Non-employee Members Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)		33,333		36,111