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Stock-Based Compensation - Summary of Stock Option Activity (Details) - 2011, 2017, and 2019 Plans
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jan. 28, 2023
USD ($)
$ / shares
shares
Jul. 30, 2022
USD ($)
$ / shares
shares
Number of Options    
Outstanding, beginning balance (in shares) | shares 4,703,564  
Granted (in shares) | shares 1,486,774  
Exercised (in shares) | shares (117,607)  
Cancelled (in shares) | shares (871,361)  
Outstanding, ending balance (in shares) | shares 5,201,370 4,703,564
Weighted- Average Exercise Price    
Outstanding, beginning balance (in dollars per share) | $ / shares $ 21.07  
Granted (in dollars per share) | $ / shares 3.79  
Exercised (in dollars per share) | $ / shares 1.31  
Cancelled (in dollars per share) | $ / shares 26.93  
Outstanding, ending balance (in dollars per share) | $ / shares $ 15.59 $ 21.07
Weighted- Average Remaining Contractual Life (in Years)    
Outstanding, weighted-average remaining contractual life 7 years 10 months 2 days 7 years 6 months 29 days
Aggregate Intrinsic Value (in thousands)    
Outstanding, aggregate intrinsic value | $ $ 1,738 $ 638