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STOCK - BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 01, 2023 shares	Nov. 23, 2021 performance_based_milestone_target shares	Sep. 07, 2021 milestone shares	Oct. 31, 2021 shares	Jun. 30, 2024 USD ($) shares	Jun. 25, 2023 USD ($)	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 25, 2023 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					$ 10,903	$ 14,402	$ 20,529	$ 28,667
Weighted average grant date fair value of options (in dollars per share) \| $ / shares							$ 8.32	$ 8.67
Performance based milestone targets \| milestone			3
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					2,957	2,104	$ 5,294	$ 4,576
Unrecognized compensation expense \| $					22,400		$ 22,400
Expected period for recognition							2 years 1 month 20 days
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					4,858	9,049	$ 10,499	$ 18,097
Unrecognized compensation expense \| $					18,000		$ 18,000
Expected period for recognition							1 year
Shares granted (in shares)				6,300,000			0	0
New shares issued (in shares)		321,428
Performance based milestone targets \| performance_based_milestone_target		3
Total shares granted (in shares)							85,395
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 \| Spyce
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $						900		$ 1,700
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					3,088	$ 3,249	$ 4,736	$ 5,994
Unrecognized compensation expense \| $					$ 11,500		$ 11,500
Expected period for recognition							1 year 10 months 2 days
Shares granted (in shares)							471,370	353,743
Fair value of shares earned \| $							$ 6,100
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