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Share-Based Compensation (Tables)
 9 Months Ended
Jul. 03, 2020
Share-based Payment Arrangement [Abstract]  
Effects of Stock-Based Compensation Expense Related to Stock-Based Awards to Employees and Nonemployees
The following table shows a summary of share-based compensation expense included in the condensed consolidated statements of operations (in thousands):
 Three Months EndedNine Months Ended
 July 3,
2020		June 28,
2019		July 3,
2020		June 28,
2019
Cost of revenue$814  $651  $2,771  $2,165  
Research and development2,921  2,517  9,939  6,540  
Selling, general and administrative4,760  (353) 14,211  11,458  
Total share-based compensation expense $8,495  $2,815  $26,921  $20,163  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
A summary of stock option activity for the nine months ended July 3, 2020 is as follows (in thousands, except per share amounts and contractual term):
Number of SharesWeighted-Average Exercise Price per ShareWeighted-Average Remaining Contractual Term (in Years)Aggregate Intrinsic Value
Options outstanding as of September 27, 2019376  $13.58  
Exercised(41) 4.12  
Forfeited, canceled or expired—  19.45  
Options outstanding as of July 3, 2020335  $14.73  7.03$6,834  
Options vested & expected to vest as of July 3, 2020335  14.73  7.036,834  
Options exercisable as of July 3, 202050  $14.40  3.07$1,037  
Summary of Restricted Stock, Restricted Stock Unit and Performance-based Restricted Stock Unit Activity
A summary of RSAs, RSUs and PRSUs activity for the nine months ended July 3, 2020 is as follows:
Number of RSAs, RSUs and PRSUs
(in thousands)		Weighted-
Average
Grate Date Fair Value		Aggregate
Intrinsic
Value
(in thousands)
 Balance as of September 27, 20192,613  $21.81  $56,649  
Granted1,203  21.96  
Vested and released(636) 26.05  
Forfeited, canceled or expired(364) 22.19  
Balance as of July 3, 20202,816  $20.86  $98,909