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STOCK - BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Thousands					1 Months Ended	12 Months Ended
	Jan. 01, 2023 shares	Nov. 23, 2021 performance_based_milestone_target shares	Nov. 22, 2021 USD ($)	Nov. 21, 2021	Oct. 31, 2021 shares	Dec. 31, 2023 USD ($) possible_scenario tranche $ / shares shares	Dec. 25, 2022 USD ($) $ / shares shares	Dec. 26, 2021 USD ($) $ / shares shares	Sep. 07, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total reserved shares of common stock						36,190,848	36,585,884
Total stock-based compensation | $						$ 49,532	$ 78,736	$ 28,897
Number of stock options (in shares)						13,219,388	13,813,922	13,773,414
Weighted average exercise price (in dollars per share) | $ / shares						$ 7.77	$ 7.86	$ 6.87
Dividend yield						0.00%
Unrecognized compensation expense | $						$ 13,200
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of options (in dollars per share) | $ / shares						$ 9.07	$ 8.02	7.84
Nonemployee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of options (in dollars per share) | $ / shares								$ 4.47
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total reserved shares of common stock						13,219,388	13,813,922
Contractual life						10 years
Total stock-based compensation | $						$ 8,878	$ 10,505	$ 15,414
Dividend yield						0.00%	0.00%	0.00%
Expected period for recognition						1 year 11 months 4 days
Expected Volatility						45.11%	44.25%	41.00%
PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						1 year
Contractual life						10 years
Total stock-based compensation | $			$ 5,400			$ 32,097	$ 36,194	$ 6,264
Weighted average grant date fair value of options (in dollars per share) | $ / shares						$ 16.35
Expected period for recognition						1 year 2 months 26 days
Shares granted (in shares)					6,300,000	0	0	6,621,248
Number of vesting tranches | tranche						7
Number of possible scenarios | possible_scenario						2
Stock-based compensation expense to be recognized | $						$ 103,000
Unrecognized compensation expense | $						$ 28,500
Granted (in dollars per share) | $ / shares								$ 15.56
PSU | Company Stock Price Target $30.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option, exercise price range, upper range limit (in dollars per share) | $ / shares						$ 30.0
PSU | Company Stock Price Target $75.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option, exercise price range, upper range limit (in dollars per share) | $ / shares						$ 75.0
PSU | Initial Public Offering Scenario
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life						10 years
Expected Volatility						52.00%
PSU | Change Of Control Scenario
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life						3 years
Expected Volatility						90.50%
PSU | Founder One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)					2,100,000
PSU | Founder Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)					2,100,000
PSU | Founder Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)					2,100,000
PSU | Spyce
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation | $						$ 2,400	$ 3,400
Employee stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total reserved shares of common stock						4,111,331	3,000,000
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Total stock-based compensation | $						$ 8,557	$ 32,037	$ 7,219
Expected period for recognition						1 year 2 months 1 day
Fair value of shares earned | $						$ 6,300	$ 15,300	$ 400
Shares granted (in shares)						428,428	724,077	2,418,793
Unrecognized compensation expense | $						$ 8,200
Granted (in dollars per share) | $ / shares						$ 9.07	$ 19.45	$ 24.20
RSUs | Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						1 year
Shares granted (in shares)						50,000
RSUs | Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						4 years
Shares granted (in shares)						1,980,125
Spyce Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		321,428
Performance based milestone targets | performance_based_milestone_target		3
Unrecognized compensation expense | $						$ 9,800
Minimum | Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						12 months
Minimum | PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period						1 year 8 months 12 days
Minimum | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period		0 years
Maximum | Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						4 years
Maximum | PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period						4 years 4 months 24 days
Maximum | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period		4 years
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
2009 Stock Plan And 2019 Equity Incentive Plan | 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 | 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 | 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
Percentage of outstanding stock maximum						1.00%
Common stock reserved for issuance, increase, threshold period						10 years
Maximum shares allowable under the plan (in shares)	4,300,000
Number of additional shares authorized (in shares)	1,111,331
Shares available
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total reserved shares of common stock						10,572,899	10,655,568
Spyce Plan | Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options (in shares)						96,151
Weighted average exercise price (in dollars per share) | $ / shares						$ 8.95

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