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Note 9 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 26, 2020
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 26,

  

September 28,

  

September 26,

  

September 28,

 

(In thousands)

 

2020

  

2019

  

2020

  

2019

 

Cost of revenue

 $834  $453  $2,322  $982 

Research and development

  2,633   1,658   7,461   4,029 

Selling, general, and administrative

  7,021   3,569   20,445   8,324 

Total stock-based compensation

 $10,488  $5,680  $30,228  $13,335 
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

  440 

Vested

  (816)
Cancelled  (14)

Balance, September 26, 2020

  1,122