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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands, € in Millions			3 Months Ended		9 Months Ended		12 Months Ended		36 Months Ended
	Aug. 05, 2025 USD ($)	Aug. 05, 2025 EUR (€)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 EUR (€)	Dec. 31, 2015 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2017 USD ($)
Recorded Unconditional Purchase Obligation [Line Items]
Foreign VAT assessments					$ 0	$ 8,692
Contingency reserve , amount			$ 9,644		9,644					$ 8,355
Indemnification liabilities			2,800		2,800
Additional liabilities recorded			0	$ 0	471	$ 0
Maximum exposure of indemnification liability			10,200		10,200
Groupon Latin America
Recorded Unconditional Purchase Obligation [Line Items]
Estimated indemnification liability											$ 5,400
Additional liabilities recorded					500
International | Groupon S.r.l. | Italy 2012 Assessment
Recorded Unconditional Purchase Obligation [Line Items]
Income tax examination, estimate of possible loss	$ 20,500	€ 17.5					$ 134,900	€ 114.8
Portuguese VAT Assessment, Periods 2013 to 2015 | Pending Litigation
Recorded Unconditional Purchase Obligation [Line Items]
Value added tax assessment, bank guarantee			4,100		4,100
Portuguese VAT Assessment, Periods 2013 to 2015 | Maximum | Pending Litigation
Recorded Unconditional Purchase Obligation [Line Items]
Foreign VAT assessments					4,600
Portuguese VAT Assessment, Periods 2011 to 2012 | Pending Litigation
Recorded Unconditional Purchase Obligation [Line Items]
Foreign VAT assessments									$ 5,000
Value added tax assessment, bank guarantee			4,400		4,400
Contingency reserve , amount			$ 4,600		$ 4,600					$ 4,600

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