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STOCK - BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 01, 2023 shares	Nov. 23, 2021 performance_based_milestone_target shares	Sep. 07, 2021 milestone shares	Oct. 31, 2021 shares	Sep. 29, 2024 USD ($) shares	Sep. 24, 2023 USD ($)	Sep. 29, 2024 USD ($) $ / shares shares	Sep. 24, 2023 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					$ 9,685	$ 11,466	$ 30,214	$ 40,133
Weighted average grant date fair value of options (in dollars per share) \| $ / shares							$ 9.32	$ 8.97
Performance based milestone targets \| milestone			3
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					3,107	2,140	$ 8,401	$ 6,716
Unrecognized compensation expense \| $					23,600		$ 23,600
Expected period for recognition							2 years 1 month 28 days
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					4,669	6,894	$ 15,168	24,991
Unrecognized compensation expense \| $					$ 13,300		$ 13,300
Expected period for recognition							11 months 19 days
Shares granted (in shares)				6,300,000			0
New shares issued (in shares)		321,428
Performance based milestone targets \| performance_based_milestone_target		3
Total shares granted (in shares)							85,395
Released (in shares)							900,000
PSUs \| Founder One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)				2,100,000
PSUs \| Founder Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)				2,100,000
PSUs \| Founder Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)				2,100,000
PSUs \| Each Founder
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Released (in shares)					300,000		33,900,000
PSUs \| Spyce
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $						700		2,400
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					$ 1,909	$ 2,432	$ 6,645	$ 8,426
Unrecognized compensation expense \| $					$ 10,700		$ 10,700
Expected period for recognition							1 year 9 months 10 days
Shares granted (in shares)							518,177	398,043
Fair value of shares earned \| $							$ 10,000
Released (in shares)							369,355	407,139
2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of common stock authorized for issuance (in shares)					35,166,753		35,166,753
Maximum number of new common stock authorized for issuance (in shares)							11,500,000
2021 Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life					10 years		10 years
2021 Plan \| Minimum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					12 months		12 months
2021 Plan \| Maximum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years		4 years
2009 Stock Plan And 2019 Equity Incentive Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life					10 years		10 years
2009 Stock Plan And 2019 Equity Incentive Plan \| Minimum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					1 year		1 year
2009 Stock Plan And 2019 Equity Incentive Plan \| Maximum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years		4 years
ESPP \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of common stock authorized for issuance (in shares)	4,111,331		3,000,000
Common stock reserved, issuance, increase period	10 years
Percentage of outstanding stock maximum	1.00%
Maximum shares allowable under the plan (in shares)	4,300,000
New shares available (in shares)	1,111,331