The following table lists the components of share-based compensation expense by type of award, which is recognized in the “Selling, general, and administrative expense” line in the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).


	Three Months Ended March 31,
	2024		2023
Restricted stock	$	587	$	167
Performance share units	259		200
Stock options	—		14
Share-based compensation expense	$	846	$	381

The following table presents the status of unvested restricted stock awards as of March 31, 2024, and activity during the three months then ended.


	Nonvested Restricted Shares	Weighted Average Grant-Date Fair Value
Unvested at January 1, 2024	3,405	$	1.41
Granted	374	5.02
Vested	(70)	3.90

Unvested at March 31, 2024	3,709	$	1.73

During the three months ended March 31, 2024, we granted 374,000 shares of restricted stock to non-executive directors, officers and certain other employees under the NN, Inc. 2022 Omnibus Incentive Plan (“2022 Omnibus Plan”). The shares of restricted stock vest pro-rata generally over three years for employees and over one year for non-executive directors.

Total grant date fair value of restricted stock that vested in the three months ended March 31, 2024, was $0.3 million.

Performance Share Units (“PSUs”) are a form of long-term incentive compensation awarded to executive officers and certain other key employees designed to directly align the interests of employees to the interests of our stockholders, and to create long-term stockholder value. The following table presents the status of unvested PSUs as of March 31, 2024, and activity during the three months then ended.


	Nonvested PSU Awards	Weighted Average Grant-Date Fair Value
Nonvested at January 1, 2024	3,789	$	1.29
Granted	143	6.42



Nonvested at March 31, 2024	3,932	$	1.48

During the three months ended March 31, 2024, we granted 143,000 PSUs to certain executive officers. These units vest, if at all, upon our achieving a specified relative total shareholder return, which will be measured against the total shareholder return of a specified index during the three-year performance period that ends December 31, 2026.