Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]

Summary of Stock Option Activity

A summary of stock options expired under our stock incentive plans and stock options outstanding as of, and changes made during, the three months ended March 31, 2019, is presented below:

	Outstanding				Exercisable
	Number of Shares Underlying Options		Weighted Average Exercise Price		Number of Shares Underlying Options	Weighted Average Exercise Price
Options outstanding, December 31, 2018	118,003		$	19.90	118,003	$	19.90
Expired	(101	)	13.18
Options outstanding, March 31, 2019	117,902		$	19.90	117,902	$	19.90