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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