Common Stock and Stock-Based Compensation (Tables)

9 Months Ended

Sep. 25, 2021

Share-based Payment Arrangement [Abstract]

Summary of Stock Options under Employee Equity Incentive Plan and Stock Option Plan for Non-Employee Directors

Information related to stock options under the Restated Employee Equity Incentive Plan and the Stock Option Plan for Non-Employee Directors is summarized as follows:

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term in Years		Aggregate Intrinsic Value (in thousands)
Outstanding at December 26, 2020		241,847		$	228.58
Granted		20,420			1,031.01
Forfeited		-			-
Expired		-			-
Exercised		(32,835	)		197.25
Outstanding at September 25, 2021		229,432		$	304.49		5.68	$	59,372
Exercisable at September 25, 2021		81,317		$	228.58		4.82	$	24,398
Vested and expected to vest at September 25, 2021		210,177		$	300.67		5.64	$	54,825

Weighted Average Assumptions used to Estimate Fair Value of Stock Options

Weighted average assumptions used to estimate fair values of stock options on the date of grants are as follows:

	2021
Expected Volatility		36.1	%
Risk-free interest rate		1.5	%
Expected Dividends		0.0	%
Exercise factor	2.6 times
Discount for post-vesting restrictions		0.0	%

Summary of Vesting Activities of Shares Issued Under Investment Share Program and Restricted Stock Awards

The following table summarizes vesting activities of shares issued under the investment share program and restricted stock awards:

	Number of Shares			Weighted Average Fair Value
Non-vested at December 26, 2020		114,316		$	263.47
Granted		17,821			877.10
Vested		(42,019	)		227.46
Forfeited		(1,000	)		370.68
Non-vested at September 25, 2021		89,118		$	402.77

Stock-Based Compensation Expense Included in Operating Expenses

The following table provides information regarding stock-based compensation expense included in operating expenses in the accompanying condensed consolidated statements of comprehensive operations:

	Thirteen weeks ended				Thirty-nine weeks ended
	September 25, 2021		September 26, 2020		September 25, 2021		September 26, 2020
	(in thousands)				(in thousands)
Amounts included in advertising, promotional and selling expenses	$	1,064	$	1,203	$	4,004	$	3,054
Amounts included in general and administrative expenses		2,647		2,429		9,998		7,681
Total stock-based compensation expense	$	3,711	$	3,632	$	14,002	$	10,735