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STOCK - BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |
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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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