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Share-Based Compensation - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2024
shares
Dec. 30, 2023
USD ($)
Mar. 30, 2024
USD ($)
Sep. 28, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 28, 2024
USD ($)
performancePeriod
shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized for issuance (in shares) 25,204,961              
Stock options outstanding (in shares)       5,406,662   5,406,662   4,477,120
Shares issued for stock option exercises (in shares)           9,677,136   9,048,906
Shares available for grant (in shares)       7,462,253   7,462,253   8,230,500
RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issuable (in shares)       2,400,113   2,400,113   1,411,310
Share-based compensation expense | $       $ 3,400,000 $ 4,400,000 $ 10,700,000 $ 14,800,000  
Unrecognized compensation expense, period of recognition           1 year 3 months 18 days    
Unrecognized compensation expense | $       19,300,000   $ 19,300,000    
RSUs | New Employees | Employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period             4 years  
RSUs | Employees | First Anniversary | Employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           25.00% 25.00%  
RSUs | Employees | Thereafter | Employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           3 years 3 years  
RSUs | Continuing Employees | Employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           1 year    
RSUs | Continuing Employees | First Anniversary | Employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           50.00% 50.00%  
RSUs | Board of Directors | Employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           1 year 1 year  
RSUs | New Board of Directors | Employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           3 years 3 years  
Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense | $       2,000,000 $ 2,100,000 $ 5,700,000 $ 9,000,000.0  
Unrecognized compensation expense | $       $ 12,100,000   $ 12,100,000    
Unrecognized compensation expense, period of recognition           1 year 2 months 12 days    
Stock Options | New Employees | First Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           25.00% 25.00%  
Stock Options | New Employees | Thereafter                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           3 years 3 years  
Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issuable (in shares)       225,967   225,967   0
Vesting percentage           200.00%    
Share-based compensation expense | $   $ 0   $ 600,000   $ 1,300,000    
Unrecognized compensation expense | $       $ 1,900,000   $ 1,900,000    
Unrecognized compensation expense, period of recognition           1 year 6 months    
Total grant fair value | $     $ 3,300,000          
Number of performance period | performancePeriod           3    
Total expense | $           $ 1,100,000    
Performance Shares | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           0.00%    
Performance Shares | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           200.00%    
Performance Shares | First Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           1 year    
Award requisite service period (in months)           10 months    
Performance Shares | Thereafter                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           2 years    
Award requisite service period (in months)           22 months    
Performance Shares | Upon Grant                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           3 years    
Award requisite service period (in months)           34 months    
2018 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Authorized (in shares) 2,144,521         2,144,521    
Shares available for grant (in shares)       7,462,253   7,462,253   8,230,500
2018 ESPP                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for grant (in shares)       3,484,845   3,484,845   2,948,715
2018 ESPP | Employee Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized for issuance (in shares)       3,484,845   3,484,845    
Number of additional shares authorized per year (in shares) 536,130              
2018 ESPP | Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issuable (in shares)       225,967   225,967    
Vesting percentage           200.00%