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Employee Benefit Plans (Summary of Available Shares for Future Grants) (Details) - shares
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 23, 2019
Sep. 29, 2019
Sep. 29, 2019
Dec. 31, 2018
Stock Options, IPO performance-based        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Granted (in shares)     2,781,249  
RSUs | Tranche One        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Stock awards, annual vesting installments (as a percentage)     33.33%  
RSUs | Tranche Two        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Stock awards, annual vesting installments (as a percentage)     33.33%  
RSUs | Tranche Three        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Stock awards, annual vesting installments (as a percentage)     33.33%  
PSUs | Tranche One        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Stock awards, annual vesting installments (as a percentage)     33.33%  
PSUs | Tranche Two        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Stock awards, annual vesting installments (as a percentage)     33.33%  
PSUs | Tranche Three        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Stock awards, annual vesting installments (as a percentage)     33.33%  
MPSUs        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Vesting period     3 years  
2018 Plan        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Shares available for grants as of December 31, 2018     3,969,000  
Additional authorized shares (in shares)     2,970,000  
Granted (in shares) (9,792,677)   (6,303,000)  
Forfeited/cancelled (in shares)     1,464,000  
Expired (in shares)     1,000  
Shares traded for taxes (in shares)     349,000  
Shares available for grants as of June 30, 2019   2,450,000 2,450,000 3,969,000
Granted (in shares)       2,800,000
2018 Plan | RSUs        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Granted (in shares)   800,000    
CEO | Stock Options, IPO performance-based        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Number of shares forfeited (in shares)     500,000  
Terminated NEO | Stock Options, IPO performance-based        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Number of shares forfeited (in shares)     300,000  
Executive Officer | RSUs        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Stock awards, annual vesting installments (as a percentage)   50.00%    
Executive Officer | PSUs        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Stock awards, annual vesting installments (as a percentage)   25.00%    
Executive Officer | MPSUs        
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares [Roll Forward]        
Stock awards, annual vesting installments (as a percentage)   25.00%