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Common Stock and Stock-Based Compensation (Tables)
3 Months Ended
Apr. 01, 2023
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 31, 2022

 

 

204,245

 

 

$

334.26

 

 

 

 

 

 

 

Granted

 

 

24,769

 

 

 

323.80

 

 

 

 

 

 

 

Exercised

 

 

-

 

 

 

-

 

 

 

 

 

 

 

Forfeited

 

 

-

 

 

 

-

 

 

 

 

 

 

 

Outstanding at April 1, 2023

 

 

229,014

 

 

$

333.13

 

 

 

5.53

 

 

$

15,387

 

Exercisable at April 1, 2023

 

 

140,402

 

 

$

267.68

 

 

 

4.36

 

 

$

12,763

 

Vested and expected to vest at April 1, 2023

 

 

197,600

 

 

$

320.34

 

 

 

5.13

 

 

$

14,862

 

 

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:

 

 

 

2023

 

Expected Volatility

 

 

39.8

%

Risk-free interest rate

 

 

3.9

%

Expected Dividends

 

 

0.0

%

Exercise factor

 

 

2.6

 

Discount for post-vesting restrictions

 

 

1.0

%

 

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 31, 2022

 

 

91,211

 

 

$

410.22

 

Granted

 

 

44,404

 

 

 

292.28

 

Vested

 

 

(26,308

)

 

 

343.57

 

Forfeited

 

 

(1,444

)

 

 

367.62

 

Non-vested at April 1, 2023

 

 

107,863

 

 

$

379.32

 

 

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

 

 

 

April 1,
2023

 

 

March 26
2022

 

 

 

(in thousands)

 

Amounts included in advertising, promotional and selling expenses

 

$

2,042

 

 

$

1,227

 

Amounts included in general and administrative expenses

 

 

2,031

 

 

 

1,695

 

Total stock-based compensation expense

 

$

4,073

 

 

$

2,922