Annual report pursuant to Section 13 and 15(d)

STOCK BASED COMPENSATION - Restricted Stock Awards (Details)

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STOCK BASED COMPENSATION - Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 28, 2020
Dec. 31, 2021
Dec. 31, 2020
Weighted Average Grant Date Fair Value      
Total stock based compensation expenses $ 1,800 $ 28,778 $ 8,006
Weighted-average period   2 years 4 months 24 days  
Restricted Stock awards      
Shares Subject to Vesting      
Balance at beginning of period, unvested shares (in shares)   280  
Issuance of additional shares (in shares)   476  
Vested (in shares)   (492)  
Balance at end of period, unvested shares (in shares)   264 280
Weighted Average Grant Date Fair Value      
Balance at beginning of Period, unvested shares (in dollars per share)   $ 4.08  
Issuance of additional shares (in dollars per share)   8.78  
Vested (in dollars per share)   6.64  
Balance at end of Period, unvested shares (in dollars per share)   $ 7.79 $ 4.08
Total stock based compensation expenses   $ 3,100 $ 600
Unrecognized stock-based compensation expense   $ 1,800  
Weighted-average period   1 year 9 months 18 days