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Acquisitions - Narrative (Details) - Marketwise, LLC - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 21, 2021
Jan. 05, 2020
May 06, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                    
Cash paid for acquisitions, net of cash acquired $ 7,139         $ 7,139 $ 0 $ 0 $ 1,483 $ 0
Amortization of intangible assets       $ 582 $ 524 1,223 $ 1,046 2,102 1,710 $ 1,721
Amortization of acquired intangible assets       206   362        
TradeSmith                    
Business Acquisition [Line Items]                    
Percentage of interests acquired   25.00%                
Business combination, step acquisition, equity interest in acquiree, including subsequent acquisition, percentage   100.00%                
Total consideration, up to   $ 9,164                
Business acquisition, transaction costs       $ 164   $ 164   $ 164 443  
Gold Stock Analyst                    
Business Acquisition [Line Items]                    
Percentage of interests acquired     100.00%              
Amortization of intangible assets                 $ 77  
Total consideration, up to     $ 1,483              
Gold Stock Analyst | Tradenames                    
Business Acquisition [Line Items]                    
Acquired finite-lived intangible assets, weighted average useful life (years)   8 years 6 months                
Gold Stock Analyst | Customer relationships                    
Business Acquisition [Line Items]                    
Acquired finite-lived intangible assets, weighted average useful life (years)   6 years                
Chaikin Holdings LLC.                    
Business Acquisition [Line Items]                    
Percentage of interests acquired 90.00%                  
Total consideration, up to $ 8,100                  
Chaikin Holdings LLC. | Tradenames                    
Business Acquisition [Line Items]                    
Acquired finite-lived intangible assets, weighted average useful life (years) 8 years 6 months                  
Chaikin Holdings LLC. | Customer relationships                    
Business Acquisition [Line Items]                    
Acquired finite-lived intangible assets, weighted average useful life (years) 6 years