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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 26, 2020
Accounting Policies [Abstract]  
Total Stock-Based Compensation Expense The following table presents details of total stock-based compensation expense that is included
in each functional line item on our condensed consolidated statements of operations:
   
Three months ended
   
Nine months ended
 
   
September 26,
2020
   
September 28,
2019
   
September 26,
2020
   
September 28,
2019
 
Cost of revenue
  $—     $1,000   $2,000   $3,000 
Research and development
   3,000    2,000    7,000    7,000 
Selling, general and administrative
   19,000    20,000    56,000    60,000 
  
 
 
   
 
 
   
 
 
   
 
 
 
Total stock-based compensation expense
  $22,000   $23,000   $65,000   $70,000