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STOCK - BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended
	Jan. 01, 2023 shares	Nov. 23, 2021 performance_based_milestone_target shares	Sep. 07, 2021 milestone shares	Oct. 31, 2021 shares	Mar. 31, 2024 USD ($) $ / shares shares	Mar. 26, 2023 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					$ 9,626	$ 14,265
Weighted average grant date fair value of options (in dollars per share) \| $ / shares					$ 7.58	$ 8.43
Performance based milestone targets \| milestone			3
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					$ 2,336	$ 2,472
Unrecognized compensation expense \| $					$ 23,400
Expected period for recognition					2 years 2 months 19 days
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					$ 5,642	$ 9,048
Unrecognized compensation expense \| $					$ 22,800
Expected period for recognition					1 year 3 months
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 \| $						$ 800
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation \| $					$ 1,648	$ 2,745
Unrecognized compensation expense \| $					$ 12,500
Expected period for recognition					1 year 10 months 24 days
Shares granted (in shares)					369,031	214,431
Fair value of shares earned \| $					$ 1,200
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
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
2021 Plan \| Minimum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					12 months
2021 Plan \| Maximum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					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
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
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
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