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Summary of Significant Accounting Policies - Narrative (Details)
shares in Thousands
3 Months Ended 12 Months Ended
May 06, 2024
Apr. 25, 2024
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Mar. 31, 2024
USD ($)
Feb. 21, 2024
USD ($)
Mar. 31, 2021
USD ($)
Significant Accounting Policies [Line Items]                  
Collateral amount       $ 15,500,000         $ 15,500,000
Letters of credit outstanding, amount       $ 0 $ 15,500,000     $ 15,500,000  
Film, Monetized on Its Own, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]       Cost of revenue, excluding depreciation and amortization Cost of revenue, excluding depreciation and amortization Cost of revenue, excluding depreciation and amortization      
Amortized film costs       $ 100,000 $ 3,200,000 $ 8,400,000      
Impairment charges related to film costs       0 0 0      
Decrease in film costs       0 700,000        
Production tax credit receivable       1,300,000 3,500,000        
Equity investment without a readily determinable fair value       800,000 800,000 3,600,000      
Impairment of long-lived assets       0 0        
Income tax benefit for stock- based compensation arrangements       $ 0 0 $ 0      
Investment From Recapitalization Transaction                  
Significant Accounting Policies [Line Items]                  
Equity securities without readily determinable fair value, acquired during period         0        
Investment From Exchange Of Receivable                  
Significant Accounting Policies [Line Items]                  
Equity securities without readily determinable fair value, acquired during period         $ 800,000        
Class A Common Stock, $0.0001 par value per share                  
Significant Accounting Policies [Line Items]                  
Stock spilt ratio 0.25                
Class B Common Stock                  
Significant Accounting Policies [Line Items]                  
Stock spilt ratio 0.25                
Common Stock                  
Significant Accounting Policies [Line Items]                  
Investment owned, balance (in shares) | shares         6        
Preferred Stock                  
Significant Accounting Policies [Line Items]                  
Investment owned, balance (in shares) | shares         500        
Minimum                  
Significant Accounting Policies [Line Items]                  
Useful life of enhancements (in years)       1 year          
Minimum | Class A Common Stock, $0.0001 par value per share                  
Significant Accounting Policies [Line Items]                  
Proposed stock split, conversion ratio   0.5              
Minimum | Class B Common Stock                  
Significant Accounting Policies [Line Items]                  
Proposed stock split, conversion ratio   0.5              
Maximum                  
Significant Accounting Policies [Line Items]                  
Useful life of enhancements (in years)       3 years          
Maximum | Class A Common Stock, $0.0001 par value per share                  
Significant Accounting Policies [Line Items]                  
Proposed stock split, conversion ratio   0.04              
Maximum | Class B Common Stock                  
Significant Accounting Policies [Line Items]                  
Proposed stock split, conversion ratio   0.04              
Accounts Receivable | Customer Concentration Risk | Customer 1                  
Significant Accounting Policies [Line Items]                  
Concentration risk (as percent)       26.00% 13.00%        
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Customer 1                  
Significant Accounting Policies [Line Items]                  
Concentration risk (as percent)       30.00% 20.00% 14.00%      
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Customer 2                  
Significant Accounting Policies [Line Items]                  
Concentration risk (as percent)         11.00% 11.00%      
Letter of Credit                  
Significant Accounting Policies [Line Items]                  
Collateral amount             $ 17,100,000 $ 17,100,000  
Repayments of long-term debt     $ 15,500,000            
BuzzFeed Japan                  
Significant Accounting Policies [Line Items]                  
Ownership interest (as percent)       52.60%          
BuzzFeed Japan | Minority Interest Partner                  
Significant Accounting Policies [Line Items]                  
Ownership interest, noncontrolling owners (as percent)       3.00%          
BuzzFeed Japan | Z Holdings Corporation                  
Significant Accounting Policies [Line Items]                  
Ownership interest, noncontrolling owners (as percent)       22.10%          
BuzzFeed Japan | Asahi Shimbun Company                  
Significant Accounting Policies [Line Items]                  
Ownership interest, noncontrolling owners (as percent)       25.30%