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GOODWILL AND INTANGIBLE ASSETS - Intangible Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Gross Carrying Value	$ 20,000	$ 20,000
Accumulated Amortization	6,417	5,917
Net Carrying Value	$ 13,583	$ 14,083

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- Definition

Intangible Liabilities, Accumulated Amortization

+ References

No definition available.

+ Details

Name:	up_IntangibleLiabilitiesAccumulatedAmortization
Namespace Prefix:	up_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Intangible Liabilities, Gross

+ References

No definition available.

+ Details

Name:	up_IntangibleLiabilitiesGross
Namespace Prefix:	up_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Intangible Liabilities, Net

+ References

No definition available.

+ Details

Name:	up_IntangibleLiabilitiesNet
Namespace Prefix:	up_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration