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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2017
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Recorded Unconditional Purchase Obligation [Line Items] |  |
Indemnification liabilities | $ 2.8 |
Maximum exposure of indemnification liability | $ 11.7 |
Groupon Latin America |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Estimated indemnification liability |  | $ 5.4

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- Definition Indemnification Liabilities Assumed + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Indemnification Liability + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Indemnification Liability, Estimated Maximum Exposure + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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