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Description of the Business (Details)
 1 Months Ended 12 Months Ended
Feb. 25, 2025
USD ($)
Dec. 11, 2024
Dec. 10, 2024
Jun. 21, 2024
USD ($)
Jun. 13, 2024
Mar. 07, 2024
USD ($)
Feb. 28, 2024
Feb. 21, 2024
USD ($)
Dec. 03, 2021
USD ($)
shares
Feb. 28, 2025
Dec. 31, 2024
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2024
USD ($)
segment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2025
USD ($)
Mar. 14, 2025
USD ($)
Description Of The Business [Line Items]                                  
Number of reportable segments | segment                         1        
Net loss                         $ 9,928,000 $ 89,322,000 $ 201,326,000    
Net loss from continuing operations                         33,956,000 55,712,000 117,559,000    
Net cash flow from operations                         20,679,000 6,103,000 7,857,000    
Net cash used in continuing operations                         (5,686,000) (692,000) $ 6,982,000    
Unrestricted cash and cash equivalents                     $ 38,648,000   38,648,000 35,637,000      
Accumulated deficit                     621,864,000   621,864,000 611,768,000      
Forecast                                  
Description Of The Business [Line Items]                                  
Cash fee payment required for optional repurchase notices                               $ 1,200,000  
Unsecured Convertible Notes, Due 2026                                  
Description Of The Business [Line Items]                                  
Aggregate principal amount                 $ 150,000,000                
Convertible Debt                                  
Description Of The Business [Line Items]                                  
Aggregate principal amount                       $ 150,000,000.0          
Repayments of long-term debt       $ 300,000   $ 30,900,000   $ 30,900,000         120,000,000        
Principal outstanding                     $ 30,000,000   $ 30,000,000 $ 150,000,000      
Repurchase price as percentage of par plus accrued and unpaid interest     101.00%                 101.00%          
Net proceeds from future asset sales (as percent)   0.95     0.95   0.95       0.95            
Convertible Debt | Subsequent Event                                  
Description Of The Business [Line Items]                                  
Repayments of long-term debt $ 300,000                                
Principal outstanding                                 $ 29,700,000
Net proceeds from future asset sales (as percent)                   0.95              
BuzzFeed, Inc.                                  
Description Of The Business [Line Items]                                  
Number of shares issued in exchange for each share (in shares) | shares                 0.306                
BuzzFeed, Inc. | Class A Common Stock, $0.0001 par value per share                                  
Description Of The Business [Line Items]                                  
Number of common shares issued (in shares) | shares                 7,720,000                
CM Partners, LLC                                  
Description Of The Business [Line Items]                                  
Membership interests acquired (as percent)                 100.00%