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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 28, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Total Stock-based Compensation Expense
The following table summarizes the total stock-based compensation expense, by operating expense category, recognized in the Condensed Consolidated Statements of Operations for the periods presented below (in thousands).
Fiscal Quarters EndedFiscal Years-to-Date Ended
September 28, 2025September 29, 2024September 28, 2025September 29, 2024
Cost of revenue$280 $101 $757 $196 
Research and development5,754 5,914 19,050 19,771 
Selling, general and administrative(1)
5,803 10,707 18,166 27,447 
Restructuring cost— 111 — 1,216 
Total stock-based compensation expense$11,837 $16,833 $37,973 $48,630 
(1)    During the quarter ended June 30, 2024, we engaged a consulting company for its services and issued RSUs in exchange for its services. In connection with this service agreement, we recorded approximately $4.4 million and $9.1 million of stock-based compensation expense for the fiscal quarter and fiscal year-to-date ended September 29, 2024, respectively.
Schedule of Stock Option Activity
The following table summarizes stock option activities for the fiscal quarter ended September 28, 2025 (in thousands, except share and per share amount).
Number of
Options
Outstanding 		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Life (Years)
Aggregate
Intrinsic
Value (1) (2)
Balances as of December 30, 20241,751,118$10.05 
Exercised(337,735)9.28 $1,632 
Forfeited(158,676)13.83 
Balances as of September 28, 20251,254,707$9.78 5.5$1,269 
(1)The intrinsic value of options exercised is based upon the value of our stock at exercise.
(2)
The aggregate intrinsic value of the stock options outstanding as of September 28, 2025 represents the value of our closing stock price at $10.09 on the last trading day of the quarter ended September 28, 2025 in excess of the exercise price multiplied by the number of options outstanding.
Schedule of RSUs and PRSUs Activity
The following table summarizes RSUs and PRSUs activities for the fiscal quarter ended September 28, 2025 (in thousands, except share and per share amount).
RSUsPRSUs
Number of
Shares
Outstanding		Weighted Average
Grant Date Fair Value 		Number of
Shares
Outstanding		Weighted Average
Grant Date Fair Value
Issued and unvested shares balances as of December 30, 202411,154,455 $9.61 2,017,646 $7.71 
Granted6,030,359 7.95 1,537,067 7.44 
Vested(3,731,405)9.36 (227,679)8.31 
Forfeited(1,914,691)9.91 (1,218,603)7.73 
Issued and unvested shares outstanding as of September 28, 202511,538,718 $8.77 2,108,431 $7.43