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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Common Stock $0.001 Par Value    
Common stock, par value (USD per share) $ 0.001 $ 0.001
Former IAC Common Stock $0.001 Par Value    
Common stock, par value (USD per share) 0.001 0.001
Former IAC Class B Convertible Common Stock $0.001 Par Value    
Common stock, par value (USD per share) $ 0.001 $ 0.001