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RELATED PARTY TRANSACTIONS - Debt (Details) - IAC - Vimeo Inc. - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Related Party Transaction [Line Items] |  |
Promissory notes | $ 0 | $ 94,565
Promissory note due on demand—related party |  |
Related Party Transaction [Line Items] |  |
Promissory notes | 0 | 44,565
Promissory note due May 2, 2023—related party |  |
Related Party Transaction [Line Items] |  |
Promissory notes | $ 0 | $ 50,000

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