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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. 25, 2023 USD ($) shares | Jun. 26, 2022 USD ($) | Jun. 25, 2023 USD ($) $ / shares shares | Jun. 26, 2022 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation | $ |  |  |  |  | $ 14,402 | $ 23,207 | $ 28,667 | $ 45,372
Weighted average grant date fair value of options (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 8.67 | $ 10.57
Performance based milestone targets | milestone |  |  | 3 |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation | $ |  |  |  |  | 2,104 | 2,567 | $ 4,576 | $ 5,099
Unrecognized compensation expense | $ |  |  |  |  | 17,800 |  | $ 17,800 |
Expected period for recognition |  |  |  |  |  |  | 2 years 2 months 15 days |
PSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total stock-based compensation | $ |  |  |  |  | 9,049 | 9,048 | $ 18,097 | $ 18,097
Unrecognized compensation expense | $ |  |  |  |  | 42,500 |  | $ 42,500 |
Expected period for recognition |  |  |  |  |  |  | 1 year 5 months 23 days |
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 |  |  |  |  |  |
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 | 800 | $ 1,700 | $ 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 | $ |  |  |  |  | 3,249 | $ 11,592 | 5,994 | $ 22,176
Unrecognized compensation expense | $ |  |  |  |  | $ 15,600 |  | $ 15,600 |
Expected period for recognition |  |  |  |  |  |  | 1 year 8 months 23 days |
Shares granted (in shares) |  |  |  |  |  |  | 353,743 | 439,764
Fair value of shares earned | $ |  |  |  |  |  |  | $ 2,900 |
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 |  |  |  |  |  |  |

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