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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2022
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Compensation Expense The consolidated statements of operations for the years ended December 31, 2022, 2021 and 2020 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):
 
 
  
2022
 
  
2021
 
  
2020
 
Cost of sales
   $ 3,498      $ 2,500      $ 2,485  
Selling and administrative expenses
     32,192        21,727        29,711  
Research and development expenses
     6,874        5,691        4,669  
    
 
 
    
 
 
    
 
 
 
Total stock-based compensation
   $ 42,564      $ 29,918      $ 36,865  
    
 
 
    
 
 
    
 
 
 
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 twelve months ended December 31, 2022, 2021 and 2020 are as follows:
 
Options Issued and Significant Weighted-Average Assumptions Used to Estimate Option Fair Values
  
2022
 
 
2021
 
 
2020
 
Options issued in thousands
     138       160       267  
Risk-free interest rate
     2.0     0.8     1.2
Expected life in years
     6       6       6  
Expected volatility
     30.7     32.4     27.8
Expected dividends
     —         —         —    
 
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant
  
2022
 
  
2021
 
  
2020
 
Exercise price
   $ 321.15      $ 281.33      $ 215.12  
Fair value
   $ 107.99      $ 91.48      $ 63.14  
Stock Options Outstanding Roll Forward
The following table summarizes stock option activity for the plans for the twelve months ended December 31, 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
    138     $ 270.49
 
 
 
to
 
 
$
364.59
 
  $ 321.15  
Exercised
    (192   $ 88.71
 
 
 
to
 
 
$
279.90
 
  $ 164.76  
Canceled
    (40   $ 188.63
 
 
 
to
 
 
$
364.59
 
  $ 252.25  
   
 
 
       
 
 
   
 
 
   
 
       
Outstanding at December 31, 2022
    597     $ 99.22
 
 
 
to
 
 
$
371.64
 
  $ 238.43  
   
 
 
       
 
 
 
 
 
 
 
 
 
       
Stock Options Outstanding by Exercise Price Range
The following table details the options outstanding at December 31, 2022 by range of exercise prices (in thousands, except per share data):
 
Exercise
Price Range
  
Number of Shares
Outstanding
 
  
Weighted-
Average
Exercise Price
 
  
Remaining
Contractual Life of
Options Outstanding
 
  
Number of Shares
Exercisable
 
  
Weighted-
Average
Exercise Price
 
$99.22 to $208.47
     213      $ 168.12        4.7        157      $ 155.59  
$208.48 to $279.90
     191      $ 243.60        7.3        82      $ 236.58  
$279.91 to $371.64
     193      $ 310.91        9.0        11      $ 294.55  
    
 
 
                      
 
 
          
Total
     597      $ 238.43        6.9        250      $ 188.21  
    
 
 
                      
 
 
          
Restricted Stock Units Unvested Roll Forward
The following table summarizes the unvested restricted stock unit award activity for the twelve months ended December 31, 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
     98      $ 322.99  
Vested
     (77    $ 219.49  
Forfeited
     (28    $ 257.26  
    
 
 
          
Unvested at December 31, 2022
     238      $ 273.60  
    
 
 
          
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 twelve months ended December 31, 2022, 2021 and 2020 are as follows:
 
Performance Stock Units Issued and Significant Assumptions Used to Estimate Fair Values
  
2022
 
 
2021
 
 
2020
 
Performance stock units issued in thousands
     40       41       58  
Risk-free interest rate
     1.6     0.2     1.3
Expected life in years
     2.9       2.9       2.9  
Expected volatility
     25.4     38.7     25.1
Average volatility of peer companies
     34.5     34.7     26.1
Correlation Coefficient
     43.0     45.8     36.6
Expected dividends
     —         —         —    
Performance Stock Units Unvested Roll Forward
The following table summarizes the unvested performance stock unit award activity for the twelve months ended December 31, 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
     8      $ 381.32  
    
 
 
          
Unvested at December 31, 2022
     111      $ 297.55