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RELATED PARTY TRANSACTIONS - Narrative (Details) - Vimeo Inc. - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]        
Compensation expense   $ 4,912 $ 2,016  
Repayment of outstanding related party debt   94,565 0  
IAC        
Related Party Transaction [Line Items]        
Compensation expense   1,000 800  
Due to related party   $ 3,000    
Repayment of outstanding related party debt $ 99,500      
Payment of accrued interest $ 4,900      
Accrued interest payable, related parties       $ 4,200
IAC | Promissory note due on demand—related party        
Related Party Transaction [Line Items]        
Interest rate, stated percentage   10.00%    
IAC | Promissory note due May 2, 2023—related party        
Related Party Transaction [Line Items]        
Interest rate, stated percentage   10.00%    
IAC | IAC Health and Welfare Benefit Plans        
Related Party Transaction [Line Items]        
Expenses incurred with related party   $ 2,700 2,700  
IAC | IAC Headquarters Occupancy        
Related Party Transaction [Line Items]        
Expenses incurred with related party   $ 900 $ 1,100