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STOCK - BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 23, 2021 performance_based_milestone_target shares | Sep. 07, 2021 milestone | Oct. 31, 2021 shares | Jun. 26, 2022 USD ($) shares | Jun. 27, 2021 USD ($) | Jun. 26, 2022 USD ($) $ / shares shares | Jun. 27, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total stock-based compensation | $ |  |  |  | $ 23,207 | $ 1,877 | $ 45,372 | $ 3,099
Weighted average grant date fair value of options (in dollars per share) | $ / shares |  |  |  |  |  | $ 10.57 | $ 4.56
Options granted (in shares) |  |  |  |  |  | 578,865 | 4,477,360
Performance based milestone targets | milestone |  | 3 |  |  |  |  |
Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total stock-based compensation | $ |  |  |  | 2,567 | 1,877 | $ 5,099 | $ 3,099
Unrecognized compensation expense | $ |  |  |  | 25,300 |  | $ 25,300 |
Expected period for recognition |  |  |  |  |  | 2 years 3 months 25 days |
PSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total stock-based compensation | $ |  |  |  | 9,048 | 0 | $ 18,097 | 0
Unrecognized compensation expense | $ |  |  |  | 78,700 |  | $ 78,700 |
Expected period for recognition |  |  |  |  |  | 2 years 5 months 23 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 |  |  |  |  |  |
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 |  | $ 1,700 |
Unrecognized compensation expense | $ |  |  |  | 9,800 |  | 9,800 |
RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total stock-based compensation | $ |  |  |  | 11,592 | $ 0 | 22,176 | $ 0
Unrecognized compensation expense | $ |  |  |  | $ 45,500 |  | $ 45,500 |
Expected period for recognition |  |  |  |  |  | 1 year 6 months 29 days |
Shares granted (in shares) |  |  |  |  |  | 439,764 | 0
Fair value of shares earned | $ |  |  |  |  |  | $ 1,300 |
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 | Stock Options | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  | 12 months |  | 12 months |
2021 Plan | Stock Options | Maximum |  |  |  |  |  |  |
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 | Stock Options | Minimum |  |  |  |  |  |  |
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 | Stock Options | Maximum |  |  |  |  |  |  |
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) |  |  |  | 3,000,000 |  | 3,000,000 |
Common stock reserved, issuance, increase period |  |  |  | 10 years |  | 10 years |
Percentage of outstanding stock maximum |  |  |  |  |  | 1.00% |
Maximum shares allowable under the plan (in shares) |  |  |  | 4,300,000 |  | 4,300,000 |

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