Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of ESPP Share Activity

The following is a summary of 2009 ESPP share activity for the nine months ended September 30, 2018:

	Shares
Available for future purchases, January 1, 2018		225,418
Additional shares reserved under 2009 ESPP		83,838
Purchases		(97,257	)
Available for future purchases, September 30, 2018		211,999