Shared-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Components of Share-Based Compensation Expense by Type of Award

The following table lists the components of share-based compensation expense by type of award. 

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Stock options	$	59	$	140	$	148	$	321
Restricted stock	591		936		1,139		1,828
Performance share units	450		335		699		558
Change in estimate of share-based award vesting (1)	(337)		—		(337)		—
Share-based compensation expense	$	763	$	1,411	$	1,649	$	2,707

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(1)    Amounts reflect the decrease in share-based compensation expense based on the change in estimate of the probability of vesting of share-based awards.

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Reconciliation of Option Activity

The following table presents stock option activity for the six months ended June 30, 2021.

	Number of Options (in thousands)	Weighted- Average Exercise Price (per share)		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2021	871	$	12.41
Exercised	(6)	7.93
Forfeited or expired	(71)	13.81
Outstanding at June 30, 2021	794	$	12.32	3.6 years	$	—	(1)
Exercisable at June 30, 2021	698	$	12.79	3.0 years	$	—	(1)

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(1)The aggregate intrinsic value is the sum of intrinsic values for each exercisable individual option grant. The intrinsic value is the amount by which the closing market price of our stock at June 30, 2021, was greater than the exercise price of any individual option grant.

Reconciliation of Restricted Stock Option Activity

The following table presents the status of unvested restricted stock awards as of June 30, 2021, and changes during the six months then ended.

	Nonvested Restricted Shares (in thousands)	Weighted Average Grant-Date Fair Value (per share)
Unvested at January 1, 2021	385	$	9.42
Granted	459	6.84
Vested	(303)	9.34
Forfeited	(65)	7.20
Unvested at June 30, 2021	476	$	7.28

Schedule of Performance Based Awards Goals with Respect to TSR and ROIC

The following table presents the goals with respect to TSR Awards and ROIC Awards granted or modified in 2021.

TSR Awards:	Threshold Performance (50% of Shares)	Target Performance (100% of Shares)	Maximum Performance (150% of Shares)
2021 grants	35th Percentile	50th Percentile	75th Percentile
ROIC Awards:	Threshold Performance (50% of Shares)	Target Performance (100% of Shares)	Maximum Performance (150% of Shares)
2021 grants	6.3%	7.0%	8.6%
2020 grants (1)	6.7%	7.9%	8.7%

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(1)The performance levels for 2020 grants were modified by the compensation committee of the board of directors in the first quarter of 2021 to adjust for the sale of the Life Sciences business and the ongoing effects of the COVID-19 pandemic.

Schedule of Number of Awards Granted and Grant Date Fair Value of Each Award in Periods

The following table presents the number of PSUs granted and the grant date fair value in the period presented.

	TSR Awards		ROIC Awards
Award Year	Shares (in thousands)	Grant Date Fair Value (per share)	Shares (in thousands)	Grant Date Fair Value (per share)
2021	142	$8.58	172	$7.20

Summary of Status of Unvested PSU Awards

The following table presents the status of unvested PSUs as of June 30, 2021, and changes during the six months then ended.

	Nonvested TSR Awards			Nonvested ROIC Awards
	Shares (in thousands)	Weighted Average Grant-Date Fair Value (per share)		Shares (in thousands)	Weighted  Average Grant-Date Fair Value (per share)
Nonvested at January 1, 2021	138	$	10.58	160	$	9.13
Granted	142	8.58		172	7.20
Forfeited	(61)	9.61		(71)	8.17
Nonvested at June 30, 2021	219	$	9.55	261	$	8.12