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Stock-based Compensation - Narrative (Details) - USD ($) $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended | 54 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 02, 2024 | Jan. 02, 2023 | Jan. 03, 2022 | Jul. 12, 2021 | Jul. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022
Depop |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |  |
Precombination service awards, replacement awards |  |  |  | $ 4.8 |  |  |
Depop | Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Deferred purchase price for post-combination share-based service arrangement |  |  |  | $ 44.0 |  |  |
Stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award expiration period |  |  |  |  |  | 10 years |
Award requisite service period |  |  |  |  |  | 4 years |
Unrecognized compensation |  |  |  |  |  | $ 5.3 |
Weighted-average period for unrecognized compensation |  |  |  |  |  | 1 year 1 month 28 days |
Stock options | Board of Directors |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award requisite service period |  |  |  |  |  | 1 year |
Restricted stock units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award requisite service period |  |  |  |  |  | 4 years |
Award vesting period |  |  |  |  |  | 4 years |
Award vesting rights, percentage |  |  |  |  |  |  | 25.00%
Interval vesting period |  |  |  |  |  | 6 months |
Weighted-average period for unrecognized compensation |  |  |  |  |  | 2 years 6 months 25 days |
Unrecognized compensation |  |  |  |  |  | $ 596.0 |
Restricted stock units | Depop And Elo7 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate fair value of awards granted |  |  |  |  | $ 78.8 |  |
Precombination service awards, replacement awards |  |  |  |  | $ 5.6 |  |
Restricted stock units | Share-based Payment Arrangement, Tranche One | Depop And Elo7 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  | 25.00% |  |
Restricted stock units | Share-based Payment Arrangement, Tranche Two | Depop And Elo7 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  | 75.00% |  |
Financial Performance Based Restricted Stock Units | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  |  | 0.00% |
Financial Performance Based Restricted Stock Units | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  |  | 200.00% |
Total Shareholder Return Performance Based Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award measurement period |  |  |  |  |  | 3 years |
2015 Equity Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Potential annual share increase (in shares) |  |  |  |  |  | 7,050,000 |
Percentage of outstanding stock |  |  |  |  |  | 5.00% |
Maximum number of additional shares issued annually (in shares) |  | 6,252,714 | 6,351,106 |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  | 56,644,564 |
Number of shares available for grant (in shares) |  |  |  |  |  | 37,275,895 |
2015 Equity Incentive Plan | Subsequent Event |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum number of additional shares issued annually (in shares) | 0 |  |  |  |  |  |

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