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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