Stockholders' Equity / Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Share-based Payment Arrangement [Abstract]

Summary of Components of Stock-Based Compensation Expense

The following table summarizes the components of share-based compensation expense, all of which has been classified as selling, general and administrative expense:

	Three Months Ended				Nine Months Ended
	September 30, 2019		September 30, 2018		September 30, 2019		September 30, 2018
Stock options	$	366	$	398	$	1,168	$	1,282
Restricted stock	606		580		1,878		1,860
Performance shares	649		173		1,442		422
Stock grants	—		—		700		579
Total share-based compensation expense	$	1,621	$	1,151	$	5,188	$	4,143