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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
shares in Thousands
3 Months Ended 12 Months Ended
Dec. 30, 2020
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2023
Mar. 31, 2023
Mar. 31, 2021
Aug. 31, 2015
Significant Accounting Policies [Line Items]                  
Collateral amount     $ 15,500,000         $ 15,500,000  
Impairment charges related to film costs     0 $ 0 $ 0        
Investment owned, balance (in shares)           6      
Equity investment without a readily determinable fair value     800,000 3,600,000   $ 0 $ 3,600,000    
Equity securities without readily determinable fair value, acquired during period   $ 800,000              
Impairment of long-lived assets     0   0        
Income tax benefit for stock- based compensation arrangements     $ 0 $ 0 $ 0        
Preferred Stock                  
Significant Accounting Policies [Line Items]                  
Investment owned, balance (in shares)   500              
Minimum                  
Significant Accounting Policies [Line Items]                  
Useful life of enhancements     1 year            
Maximum                  
Significant Accounting Policies [Line Items]                  
Useful life of enhancements     3 years            
Accounts Receivable | Customer Concentration Risk | Customer 1                  
Significant Accounting Policies [Line Items]                  
Concentration risk, percentage     12.00% 16.00%          
Accounts Receivable | Customer Concentration Risk | Customer 2                  
Significant Accounting Policies [Line Items]                  
Concentration risk, percentage     12.00% 13.00%          
Accounts Receivable | Customer Concentration Risk | Customer 3                  
Significant Accounting Policies [Line Items]                  
Concentration risk, percentage     12.00% 10.00%          
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Customer 1                  
Significant Accounting Policies [Line Items]                  
Concentration risk, percentage     17.00% 14.00% 13.00%        
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Customer 2                  
Significant Accounting Policies [Line Items]                  
Concentration risk, percentage     11.00% 11.00% 12.00%        
Revolving Credit Facility                  
Significant Accounting Policies [Line Items]                  
Debt instrument term 3 years                
Maximum borrowing capacity $ 50,000,000                
BuzzFeed Japan                  
Significant Accounting Policies [Line Items]                  
Ownership interest, parent (in percent)                 51.00%
Ownership interest, noncontrolling owners (in percent)     49.00%            
BuzzFeed Japan | Z Holdings Corporation                  
Significant Accounting Policies [Line Items]                  
Ownership interest, noncontrolling owners (in percent)                 21.50%
BuzzFeed Japan | Asahi Shimbun Company                  
Significant Accounting Policies [Line Items]                  
Ownership interest, noncontrolling owners (in percent)                 24.50%
BuzzFeed Japan | ValueCommerce Co. Ltd.                  
Significant Accounting Policies [Line Items]                  
Ownership interest, noncontrolling owners (in percent)                 3.00%