COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Jul. 31, 2024 USD ($)	Jun. 30, 2023 USD ($) plaintiff	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2017 USD ($)
Recorded Unconditional Purchase Obligation [Line Items]
Net future payment, remainder of fiscal year, period increase (decrease)	$ (2,700)
Net future payment, year one, period increase (decrease)	(3,000)
Net future payment, year two, period increase (decrease)	15,000
Net future payment, period increase (decrease)	9,300
Foreign VAT assessments					$ 8,692	$ 0
Contingency reserve , amount			$ 8,874		8,874		$ 0
Indemnification liabilities			2,800		2,800
Maximum exposure of indemnification liability			11,700		11,700
International | Groupon S.r.l.
Recorded Unconditional Purchase Obligation [Line Items]
Income tax examination, estimate of possible loss	$ 33,100				125,400
Groupon Latin America
Recorded Unconditional Purchase Obligation [Line Items]
Estimated indemnification liability								$ 5,400
Derivative Lawsuits
Recorded Unconditional Purchase Obligation [Line Items]
Loss contingency, number of plaintiffs | plaintiff		4
Litigation settlement amount		$ 950
Portuguese VAT Assessment, Periods 2013 to 2015
Recorded Unconditional Purchase Obligation [Line Items]
Contingency reserve , amount				$ 4,100
Tax and penalties within selling, general and administrative				3,300
Value added tax assessment, interest expense				$ 800
Portuguese VAT Assessment, Periods 2013 to 2015 | Pending Litigation
Recorded Unconditional Purchase Obligation [Line Items]
Value added tax assessment, bank guarantee			3,900		3,900
Portuguese VAT Assessment, Periods 2013 to 2015 | Pending Litigation | Maximum
Recorded Unconditional Purchase Obligation [Line Items]
Foreign VAT assessments					4,300
Portuguese VAT Assessment, Periods 2011 to 2012 | Pending Litigation
Recorded Unconditional Purchase Obligation [Line Items]
Contingency reserve , amount			4,600		4,600
Tax and penalties within selling, general and administrative			3,700
Value added tax assessment, interest expense			900
Value added tax assessment, bank guarantee			$ 4,200		4,200
Portuguese VAT Assessment, Periods 2011 to 2012 | Pending Litigation | Maximum
Recorded Unconditional Purchase Obligation [Line Items]
Foreign VAT assessments					$ 4,600