The Company has awarded stock options to certain employees of the Company and certain non-employee members of its Board of Directors. The grants generally vest over a four-year period. The fair value of stock options is determined using the Black-Scholes option pricing model. There were no stock options granted during the 13 weeks ended March 29, 2020.

A summary of stock option activity for the 13 weeks ended March 29, 2020 is as follows:

Options	Shares (Thousands)			Weighted Average Exercise Price		Aggregate Intrinsic Value (Thousands)		Weighted Average Remaining Term (Years)
Outstanding—December 29, 2019		1,774		$	11.34	$	—		4.33
Granted		—			—
Exercised		—			—
Canceled		(33	)		10.51
Outstanding—March 29, 2020		1,741			11.35	$	—		4.01
Exercisable—March 29, 2020		1,563		$	11.12	$	—		3.60

Stock-based compensation related to stock options is measured at the grant date based on the calculated fair value of the award, and is recognized as expense over the requisite employee service period, which is generally the vesting period of the grant with a corresponding increase to additional paid-in capital. For the 13 weeks ended March 29, 2020, the Company recognized stock-based compensation expense related to stock options of $0.2 million. For the 13 weeks ended March 31, 2019, the Company recognized stock-based compensation expense related to stock options of $0.3 million. As of March 29, 2020, unrecognized stock-based compensation expense for stock options was $0.6 million, which will be recognized through fiscal year 2022. The Company records stock-based compensation expense within general and administrative expenses in the condensed consolidated statements of operations.

The Company awards restricted stock units (“RSUs”) to certain employees of the Company and certain non-employee members of its Board of Directors. The Board of Director grants have a vesting schedule of 50% on the first anniversary of the grant date and 50% on the second anniversary of the grant date. The employee grants vest in one-third increments over a three-year period. For the 13 weeks ended March 29, 2020, the Company recognized stock-based compensation expense related to RSUs of $0.3 million. For the 13 weeks ended March 31, 2019, the Company recognized stock-based compensation expense related to RSUs of $0.2 million. As of March 29, 2020, unrecognized stock-based compensation expense for RSUs was $1.9 million, which will be recognized though fiscal year 2023.

RSUs	Number of RSUs (Thousands)			Weighted Average Fair Value per Share
Non-vested as of December 29, 2019		463		$	7.59
Granted		158			3.88
Vested		(68	)		3.18
Canceled		—			—
Non-vested as of March 29, 2020		553		$	6.38

The Company awards performance share units (“PSUs”) to eligible employees; the PSUs are subject to service and performance vesting conditions. In March 2019 the Company issued 188,414 PSUs with a grant date fair value of $8.46 per share. The PSUs will vest based on the Company’s achievement of certain targets related to adjusted EBITDA and same store sales goals. The PSUs will vest fully on the third anniversary of the grant date. The quantity of shares that will vest ranges from 0% to 200% of the targeted number of shares. If the defined minimum targets are not met, then no shares will vest. For the 13 weeks ended March 29, 2020 and March 31, 2019, no expense was recognized related to PSUs.