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RELATED PARTY TRANSACTIONS - Carrying Value and Fair Value of Financial Instruments (Details) - IAC - Vimeo Inc. - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Carrying Value    
Related Party Transaction [Line Items]    
Promissory note due on demand—related party $ 0 $ 44,565
Long-term debt—related party 0 50,000
Fair Value    
Related Party Transaction [Line Items]    
Promissory note due on demand—related party 0 44,565
Long-term debt—related party $ 0 $ 54,545