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RELATED PARTY TRANSACTIONS WITH IAC - Narrative (Details) - IAC - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Services Agreement      
Related Party Transaction [Line Items]      
Charges for services rendered pursuant to the services agreement $ 1,100,000 $ 1,200,000  
Outstanding payables due 100,000   $ 0
Outstanding receivable due     0
Sublease Agreement      
Related Party Transaction [Line Items]      
Outstanding receivable due 0   $ 100,000
Revenue from related parties 400,000 400,000  
Tax Sharing Agreement      
Related Party Transaction [Line Items]      
Outstanding payables due 900,000 900,000  
Distribution to IAC pursuant to the tax sharing agreement $ 0 $ 0  
Employee Matters Agreement | Class B Common Stock      
Related Party Transaction [Line Items]      
Shares received from related party pursuant to employee matters agreement (shares) 100,000 200,000  
Employee Matters Agreement | Class A Common Stock      
Related Party Transaction [Line Items]      
Shares received from related party pursuant to employee matters agreement (shares) 2,600,000 0