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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% |  |

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