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Stock Based Compensation - Stock option activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 24, 2021
Dec. 31, 2021
Dec. 31, 2020
Number of share options      
Beginning balance (in shares)   3,672,968  
Granted (in shares) 9,250,000 13,262,016  
Forfeited (in shares)   (2,012,851)  
Exercised (in shares)   (1,124,577)  
Ending balance (in shares)   13,797,556 3,672,968
Weighted average exercise price      
Beginning balance (in dollars per share)   $ 2.90  
Granted (in dollars per share)   5.76  
Forfeited (in dollars per share)   3.61  
Exercised (in dollars per share)   2.74  
Ending balance (in dollars per share)   $ 5.55 $ 2.90
Stock option activity, additional disclosures      
Weighted average remaining contractual term, options outstanding   8 years 7 months 6 days 8 years 10 months 24 days
Aggregate intrinsic value, options outstanding   $ 712 $ 6,641
Number of share options, vested and expected to vest (in shares)   12,685,817  
Weighted average exercise price, vested and expected to vest (in dollars per share)   $ 5.51  
Weighted average remaining contractual term, vested and expected to vest   8 years 7 months 6 days  
Aggregate intrinsic value, vested and expected to vest   $ 709  
Number of share options, exercisable (in shares)   1,598,709  
Weighted average exercise price, exercisable (in dollars per share)   $ 3.60  
Weighted average remaining contractual term, exercisable   7 years 2 months 12 days  
Aggregate intrinsic value, exercisable   $ 406