Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

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

Summary of Stock Option Activity

A summary of stock options expired and forfeited under our stock incentive plans and stock options outstanding as of, and changes made during, the six months ended June 30, 2018, is presented below (shares in thousands):

	Outstanding				Exercisable
	Number of Shares Underlying Options		Weighted Average Exercise Price		Number of Shares Underlying Options	Weighted Average Exercise Price
Options outstanding, December 31, 2017	1,202		$	1.99	1,202	$	1.99
Expired	(3	)	2.45
Forfeited	(10	)	1.63
Options outstanding, June 30, 2018	1,189		$	1.99	1,189	$	1.99