NON-CONTROLLING INTERESTS - Narrative (Details)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Noncontrolling Interest [Abstract]
Weighted average ownership percentage by parent (as a percent)	0	0	0

Noncontrolling Interest, Weighted Average Ownership Percentage by Parent

No definition available.

Name:	up_NoncontrollingInterestWeightedAverageOwnershipPercentageByParent
Namespace Prefix:	up_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration