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v3.23.1

NON-CONTROLLING INTERESTS - Narrative (Details) | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Noncontrolling Interest [Abstract] |  |
Weighted average ownership percentage by parent (as a percent) | 0.000 | 0.004

X
- Definition Noncontrolling Interest, Weighted Average Ownership Percentage by Parent + References No definition available. + Details
Name: | up_NoncontrollingInterestWeightedAverageOwnershipPercentageByParent
Namespace Prefix: | up_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_NoncontrollingInterestAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration