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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 01, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 14, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant-date fair value per share of options granted (in dollars per share)   $ 12.93 $ 15.18  
Fair value of options vested   $ 11,438 $ 4,198  
Stock-based compensation expense   14,037 $ 7,765  
Unrecognized compensation cost, options   $ 31,192    
2020 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, number of shares reserved (in shares)   5,211,827   6,665,891
Increase of authorized shares, percent of common stock outstanding       4.00%
2020 Plan | Subsequent event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Increase in number of shares authorized (in shares) 1,449,384      
2020 Plan | Non-employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued in period (in shares)   12,456 505  
2020 ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, number of shares reserved (in shares)   646,566   326,364
Increase of authorized shares, percent of common stock outstanding       1.00%
2020 ESPP | Subsequent event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Increase in number of shares authorized (in shares) 326,364      
Unvested restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Fair value of restricted stock vested   $ 714 $ 200  
Unrecognized compensation cost, recognition period   1 year 4 months 24 days    
Unrecognized compensation cost   $ 636    
Options to purchase common stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 12,964 $ 7,344  
Unrecognized compensation cost, recognition period   2 years 6 months