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Assets Held for Sale and Divested Operations - Summary of Assets and Liabilities Held for Sale Related to Divestment (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Nov. 06, 2020
Jan. 01, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash and cash equivalents $ 2,479,880 $ 601,075 $ 257,730     $ 76,130
Increase (Decrease) in Prepaid Expense 887 13,335        
Increase (Decrease) in Other Noncurrent Assets (60,749) (62,818)        
Increase (Decrease) Operating Lease Right Of Use Assets $ (16,838) $ (5,826)        
Brand Protection, AntiPiracy, and AntiFraud Solutions | Discontinued Operations, Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Purchase price         $ 3,751  
Techstreet Business | Discontinued Operations, Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Purchase price       $ 42,832