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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Restricted stock	$	1,001	471		1,780		3,233
Performance share units	206		(201)		264		505
Stock options	—		$	37	$	14	$	124
Share-based compensation expense	$	1,207	$	307	$	2,058	$	3,862

The following table presents the status of unvested restricted stock awards as of September 30, 2023 and changes during the nine months then ended.


	Nonvested Restricted Shares	Weighted Average Grant-Date Fair Value
Unvested at January 1, 2023	1,038	$	4.03
Granted	3,711	1.37
Vested	(1,130)	3.65
Forfeited	(160)	1.51
Unvested at September 30, 2023	3,459	$	1.41

During the nine months ended September 30, 2023, we granted 1,881,000 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.

During the nine months ended September 30, 2023, we granted 1,830,000 shares of restricted stock to new executive officers as inducement awards, which vest pro-rata over five years.

Total grant date fair value of restricted stock that vested in the nine months ended September 30, 2023, was $4.1 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 September 30, 2023 and activity during the nine months then ended.



	Nonvested PSU Awards	Weighted Average Grant-Date Fair Value
Nonvested at January 1, 2023	1,031	$	3.80
Granted	3,621	1.14
Vested	(67)	4.63
Forfeited	(634)	2.47

Nonvested at September 30, 2023	3,951	$	1.56

During the nine months ended September 30, 2023, we granted 561,000 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, 2025.

During the nine months ended September 30, 2023, we granted 3,060,000 PSUs to new executive officers as inducement awards. These units cliff-vest after five years and are contingent on the Company’s stock price meeting specified thresholds.

We estimated the grant date fair value of the PSU awards using the Monte Carlo simulation model, as the total shareholder return metric and changes in stock price are considered market conditions under ASC Topic 718, Compensation – stock compensation.

During the nine months ended September 30, 2023, 67,000 PSUs were subject to accelerated vesting upon a participant’s termination that was a qualifying event under the terms of the PSU award agreements. Total grant date fair value of PSUs that vested in the nine months ended September 30, 2023, was $0.3 million.