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STOCK - BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2023 shares | Nov. 23, 2021 performance_based_milestone_target shares | Nov. 21, 2021 | Oct. 31, 2021 shares | Mar. 31, 2026 USD ($) | Dec. 28, 2025 USD ($) tranche possible_scenario $ / shares shares | Mar. 31, 2026 USD ($) | Dec. 28, 2025 USD ($) tranche possible_scenario $ / shares shares | Dec. 29, 2024 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares | Sep. 07, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reserved shares of common stock |  |  |  |  |  | 30,367,496 |  | 30,367,496 | 31,707,440 |  |
Share based compensation | $ |  |  |  |  |  |  |  | $ 36,475 | $ 39,024 | $ 49,532 |
Weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  |  | $ 10.35 |  | $ 10.35 | $ 9.88 | $ 7.77 |
Intrinsic value of options exercised | $ |  |  |  |  |  |  |  | $ 50,800 | $ 4,300 | $ 7,500 |
Dividend yield |  |  |  |  |  |  |  | 0.00% |  |  |
Unrecognized compensation expense | $ |  |  |  |  |  | $ 22,500 |  | $ 22,500 |  |  |
Unrecognized compensation expense | $ |  |  |  |  |  | $ 103,000 |  | 103,000 |  |  |
Tax expense from award | $ |  |  |  |  |  |  |  | $ 1,100 |  |  |
Options, weighted average exercise price | $ / shares |  |  |  |  |  | $ 10.39 |  | $ 10.39 |  |  |
Options modified |  |  |  |  |  | 924,097 |  |  |  |  |
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 |  |  |  |  |  |  |  | $ 8.24 | $ 9.72 |  |
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 |  |  |  |  |  |  |  |  |  | $ 9.07 |
Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reserved shares of common stock |  |  |  |  |  | 14,070,559 |  | 14,070,559 | 13,169,869 |  |
Contractual life |  |  |  |  |  |  |  | 10 years |  |  |
Share based compensation | $ |  |  |  |  |  |  |  | $ 18,605 | $ 11,773 | $ 8,878 |
Dividend yield |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00% |
Expected period for recognition |  |  |  |  |  |  |  | 2 years 3 months 3 days |  |  |
Expected Volatility |  |  |  |  |  |  |  | 47.80% | 45.40% | 45.10% |
Incremental costs | $ |  |  |  |  |  |  |  | $ 1,500 |  |  |
PSU |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |
Contractual life |  |  |  |  |  |  |  | 10 years |  |  |
Share based compensation | $ |  |  |  |  |  |  |  | $ 9,118 | $ 18,705 | $ 32,097 |
Weighted average grant date fair value of options (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 16.35 |  |  |
Expected period for recognition |  |  |  |  |  |  |  | 2 months 19 days |  |  |
Shares granted (in shares) |  |  |  | 6,300,000 |  |  |  |  |  |  |
Number of vesting tranches | tranche |  |  |  |  |  | 7 |  | 7 |  |  |
Number of possible scenarios | possible_scenario |  |  |  |  |  | 2 |  | 2 |  |  |
Unrecognized compensation expense | $ |  |  |  |  |  | $ 600 |  | $ 600 |  |  |
Awards exercised |  |  |  |  |  |  |  | 1,800,000 |  |  |
Fair value of award | $ |  |  |  |  |  |  |  | $ 67,800 |  |  |
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 |  |  |  |  |  |  |  | $ 30.00 |  |  |
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 |  |  |  |  |  |  |  | $ 75.00 |  |  |
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 |  |  |  |  |  |  |
Awards exercised |  |  |  |  |  |  |  | 600,000 |  |  |
PSU | Founder Two |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  | 2,100,000 |  |  |  |  |  |  |
Awards exercised |  |  |  |  |  |  |  | 600,000 |  |  |
PSU | Founder Three |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  | 2,100,000 |  |  |  |  |  |  |
Awards exercised |  |  |  |  |  |  |  | 600,000 |  |  |
PSU | Spyce |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based compensation | $ |  |  |  |  |  |  |  | $ 2,400 |  |  |
Employee stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reserved shares of common stock |  |  |  |  |  | 4,111,331 |  | 4,111,331 | 4,111,331 |  |
RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |  |  |  |
Share based compensation | $ |  |  |  |  |  |  |  | $ 8,752 | $ 8,546 | 8,557 |
Expected period for recognition |  |  |  |  |  |  |  |  | 2 years 7 months 9 days |  |
Fair value of shares earned | $ |  |  |  |  |  |  |  | $ 12,700 | $ 13,700 | $ 6,300 |
Shares granted (in shares) |  |  |  |  |  |  |  | 752,781 | 535,789 |  |
Unrecognized compensation expense | $ |  |  |  |  |  |  |  |  | $ 7,300 |  |
Awards exercised |  |  |  |  |  |  |  | 690,957 |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 13.49 | $ 20.81 | $ 9.07 |
Spyce Performance Stock Units |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  | 321,428 |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  |  |  |  | 85,395 |  | 85,395 |  |  |
Performance based milestone targets | performance_based_milestone_target |  | 3 |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  | 1 year 8 months 12 days |  |  |
Minimum | Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 12 months |  |  |
Minimum | RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service period |  | 0 years |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  | 4 years 4 months 24 days |  |  |
Maximum | Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 4 years |  |  |
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 |  | 35,166,753 |  |  |
Maximum number of new common stock authorized for issuance (in shares) |  |  |  |  |  |  |  | 11,500,000 |  |  |
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 |  | 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 |  |  |  |  |  | 6,652,380 |  | 6,652,380 | 8,516,216 |  |
Awards Prior to the 2021 Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contractual life |  |  |  |  |  |  |  | 10 years |  |  |
Awards Prior to the 2021 Plan | Minimum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |
Awards Prior to the 2021 Plan | Minimum | Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |
Awards Prior to the 2021 Plan | Maximum | Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 4 years |  |  |
Forecast | Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incremental costs | $ |  |  |  |  |  |  | $ 1,400 |  |  |  |
Forecast | RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incremental costs | $ |  |  |  |  | $ 150 |  |  |  |  |  |
Executive Officer |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options, weighted average exercise price | $ / shares |  |  |  |  |  | $ 6.77 |  | $ 6.77 |  |  |
Options modified |  |  |  |  |  | 2,471,052 |  |  |  |  |
Executive Officer | Forecast | Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incremental costs | $ |  |  |  |  |  |  | $ 6,100 |  |  |  |

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