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Note 10 - Stock-based Compensation Plans (Tables)
12 Months Ended
Dec. 28, 2024
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Year Ended

 
  

December 28,

  

December 30,

  

December 31,

 

(In thousands)

 

2024

  

2023

  

2022

 

Cost of revenue

 $2,731  $4,506  $3,674 

Research and development

  29,033   27,782   19,645 

Selling, general, and administrative

  21,221   37,909   32,211 

Total stock-based compensation

 $52,985  $70,197  $55,530 
Schedule of Share-based Payment Award, Stock Options and Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
  

Year Ended

  

December 28,

 

December 30,

 

December 31,

  

2024

 

2023

 

2022

Employee Stock Purchase Plan

      

Weighted average expected volatility

 

52.6%

 

48.2%

 

60.3%

Weighted average risk-free interest rate

 

4.88%

 

5.37%

 

3.74%

Expected term (in months)

 

6

 

6

 

6

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

(Shares and aggregate intrinsic value in thousands)

 

Shares

  

Weighted average exercise price

  

Weighted average remaining contractual term (years)

  

Aggregate Intrinsic Value

 

Balance, December 30, 2023

  428  $6.75         

Granted

              

Exercised

  (425)  6.76         

Forfeited or expired

  (3)  5.73         

Balance, December 28, 2024

    $         

Vested and expected to vest at December 28, 2024

    $     $ 

Exercisable, December 28, 2024

    $     $ 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

(Shares in thousands)

 

Shares

  

Weighted average grant date fair value

 

Balance, December 30, 2023

  1,881  $72.31 

Granted

  1,854   60.74 

Vested

  (741)  67.88 

Forfeited or expired

  (557)  70.82 

Balance, December 28, 2024

  2,437  $65.19 
Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block]
  

Year Ended

  

December 28,

 

December 30,

 

December 31,

  

2024

 

2023

 

2022

Executive RSUs with a market condition or performance condition

      

Weighted average expected volatility

 

51.04% to 53.96%

 

50.97% to 54.31%

 

51.44%

Weighted average risk-free interest rate

 

3.39% to 4.53%

 

4.28% to 4.59%

 

1.67%

Expected term (years)

 

3 to 6

 

3

 

3

Share-Based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block]

(Shares in thousands)

 

Shares

  

Weighted average grant date fair value

 

Balance, December 30, 2023

  852  $84.72 

Granted

  1,641   63.06 

Effect of vesting multiplier

  285     

Vested

  (551)  68.32 

Canceled

  (634)  92.51 

Balance, December 28, 2024

  1,593  $62.24