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Stock-Based Compensation (Tables)
6 Months Ended
Jul. 02, 2022
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Compensation Expense
The consolidated statements of operations for the three and six months ended July 2, 2022 and July 3, 2021 include the following stock-based compensation expense related to stock option awards, restricted stock awards, restricted stock unit awards, performance stock unit awards and the employee stock purchase plan (in thousands):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
Three Months Ended
    
Six Months Ended
 
    
July 2, 2022
    
July 3, 2021
    
July 2, 2022
    
July 3, 2021
 
Cost of sales
   $ 915      $ 727      $ 1,942      $ 1,360  
Selling and administrative expenses
     7,264        5,274        15,433        11,694  
Research and development expenses
     1,610        1,290        3,347        2,542  
    
 
 
    
 
 
    
 
 
    
 
 
 
Total stock-based compensation
   $ 9,789      $ 7,291      $ 20,722      $ 15,596  
    
 
 
    
 
 
    
 
 
    
 
 
 
Summary of Relevant Data Used to Determine the Value of Stock Options Granted During the Period The relevant data used to determine the value of the stock options granted during the six months ended July 2, 2022 and July 3, 2021 are as follows:
 
 
 
 
 
 
 
 
 
 
    
Six Months Ended
 
Options Issued and Significant Assumptions Used to Estimate Option Fair Values
  
July 2, 2022
   
July 3, 2021
 
Options issued in thousands
     127       159  
Risk-free interest rate
     1.9     0.8
Expected life in years
     6       6  
Expected volatility
     30.9     32.5
Expected dividends
     —         —    
Summary of Stock Options Outstanding Roll Forward
 

 
  
Six Months Ended
 
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant
  
July 2, 2022
 
  
July 3, 2021
 
 
 
 
 
 
 
 
 
 
Exercise price
   $ 321.91      $ 280.92  
Fair value
   $ 107.76      $ 91.42  
Summary of Stock Options Outstanding by Exercise Price Range
The following table summarizes stock option activity for the plans for the six months ended July 2, 2022 (in thousands, except per share data):
 
 
  
Number of Shares
 
  
Exercise Price per Share
 
  
Weighted-Average

Exercise Price per

Share
 
Outstanding at December 31, 2021
     691      $ 88.71      to   $ 371.64      $ 202.24  
Granted
     127      $ 314.98      to   $ 364.59      $ 321.91  
Exercised
     (150    $ 88.71      to   $ 279.90      $ 170.44  
Canceled
     (18    $ 203.37      to   $ 364.59      $ 250.27  
    
 
 
                                 
Outstanding at July 2, 2022
     650      $ 88.71      to   $ 371.64      $ 231.63  
    
 
 
                                 
Summary of Restricted Stock Units Unvested Roll Forward
The following table summarizes the unvested restricted stock unit award activity for the six months ended July 2, 2022 (in thousands, except per share data):
 
 
  
Shares
 
  
Weighted-Average

Grant Date Fair

Value per Share
 
Unvested at December 31, 2021
     245      $ 234.97  
Granted
     94      $ 323.65  
Vested
     (71    $ 220.07  
Forfeited
     (16    $ 256.66  
    
 
 
          
Unvested at July 2, 2022
     252      $ 270.87  
    
 
 
          
Summary of Relevant Data Used to Determine the Value of Performance Shares The relevant data used to determine the value of the performance stock units granted during the six months ended July 2, 2022 and July 3, 2021 are as follows:
 
 
  
Six Months Ended
 
Performance Stock Units Issued and Significant Assumptions Used to Estimate Fair Values
  
July 2, 2022
 
 
July 3, 2021
 
 
 
 
 
 
 
 
 
 
Performance stock units issued (in thousands)
     40       41  
Risk-free interest rate
     1.6     0.2
Expected life in years
     2.9       2.9  
Expected volatility
     25.4     38.7
Average volatility of peer companies
     34.5     34.7
Correlation coefficient
     43.0     45.8
Expected dividends
     —         —    
Summary of Performance Stock Units Unvested Roll Forward
The following table summarizes the unvested performance stock unit award activity for the six months ended July 2, 2022 (in thousands, except per share data):
 
 
 
 
 
 
 
 
 
 
    
Shares
    
Weighted-Average

Fair Value per
Share
 
Unvested at December 31, 2021
     87      $ 285.73  
Granted
     40      $ 313.21  
Vested
     (24    $ 308.71  
Forfeited
     10      $ 370.15  
    
 
 
          
Unvested at July 2, 2022
     113      $ 298.05