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Stock-Based Compensation (Tables)
6 Months Ended
Jul. 03, 2020
Share-based Payment Arrangement [Abstract]  
Allocated Employee Stock-Based Compensation Expense
We allocated the stock-based compensation expense for our equity incentive plans and our 2000 Employee Stock Purchase Plan (ESPP) as follows (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2020
 
2019
 
2020
 
2019
Research and development
$
6,112

 
$
5,138

 
$
11,198

 
$
9,444

Selling, general and administrative
10,042

 
9,941

 
18,938

 
18,164

Total stock-based compensation
$
16,154

 
$
15,079

 
$
30,136

 
$
27,608