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Note 9 - Stock-based Compensation (Tables)
3 Months Ended
Mar. 28, 2020
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Three Months Ended

 
   

March 28,

   

March 30,

 

(In thousands)

 

2020

   

2019

 

Cost of revenue

  $ 591     $ 202  

Research and development

    2,594       1,125  

Selling, general, and administrative

    5,543       2,359  

Total stock-based compensation

  $ 8,728     $ 3,686  
Share-based Payment Arrangement, Performance Shares, Activity [Table Text Block]

(Shares in thousands)

 

Total

 

Balance, December 28, 2019

    1,163  
Granted     349  

Effect of vesting multiplier

    91  

Vested

    (182 )

Balance, March 28, 2020

    1,421