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v3.21.4

Summary of Significant Accounting Policies (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) customer letter | Dec. 31, 2019 USD ($) letter customer | Dec. 31, 2018 USD ($) customer | Sep. 30, 2021 USD ($) | Aug. 31, 2015
Collateral amount | $ 15,500,000 | $ 15,500,000 |  |  |
Number of letters of credit | letter | 2 | 2 |  |  |
Number of customers | customer | 2 | 2 |  |  |
Film costs | $ 2,100,000 |  |  |  |
Amortization of film costs | 0 | $ 0 | $ 0 |  |
Impairment charges related to film costs | 0 | 0 | 0 |  |
Equity investment without a readily determinable fair value | 2,300,000 | 1,800,000 |  |  |
Increase in fair value of investment | 500,000 |  |  |  |
Impairment of long-lived assets | 0 | 0 | 0 |  |
Unrecognized tax benefits | 0 | 0 |  | $ 0 |
Income tax benefit for stock- based compensation arrangements | $ 0 | $ 0 | $ 0 |  |
Minimum |  |  |  |  |
Useful life of enhancements | 1 year |  |  |  |
Maximum |  |  |  |  |
Useful life of enhancements | 3 years |  |  |  |
Furniture and fixtures |  |  |  |  |
Useful lives of property and equipment (in years) | 5 years |  |  |  |
Leasehold improvements. | Minimum |  |  |  |  |
Useful lives of property and equipment (in years) | 7 years |  |  |  |
Leasehold improvements. | Maximum |  |  |  |  |
Useful lives of property and equipment (in years) | 11 years |  |  |  |
Computer equipment |  |  |  |  |
Useful lives of property and equipment (in years) | 3 years |  |  |  |
Video equipment |  |  |  |  |
Useful lives of property and equipment (in years) | 3 years |  |  |  |
Customers |  |  |  |  |
Number of customers | customer | 4 | 2 | 3 |  |
Accounts receivable | Customers |  |  |  |  |
Concentration risk (in percent) | 13.00% | 11.00% |  |  |
Accounts receivable | Customers | Four customers |  |  |  |  |
Concentration risk (in percent) | 10.00% |  |  |  |
Accounts receivable | Customers | Two customers |  |  |  |  |
Concentration risk (in percent) | 13.00% | 10.00% |  |  |
Accounts receivable | Customers | Three customers |  |  |  |  |
Concentration risk (in percent) | 12.00% |  |  |  |
Revenue | Customers |  |  |  |  |
Concentration risk (in percent) | 13.00% | 12.00% | 12.00% |  |
Revenue | Customers | Two customers |  |  |  |  |
Concentration risk (in percent) | 10.00% | 10.00% | 10.00% |  |
Revenue | Customers | Three customers |  |  |  |  |
Concentration risk (in percent) |  |  | 10.00% |  |
BuzzFeed Japan |  |  |  |  |
Ownership interest (in percent) |  |  |  |  | 51.00%
Ownership interest (in percent) | 49.00% |  |  |  |
BuzzFeed Japan | Z Holdings Corporation |  |  |  |  |
Ownership interest (in percent) |  |  |  |  | 24.50%
BuzzFeed Japan | Asahi Shimbun Company |  |  |  |  |
Ownership interest (in percent) |  |  |  |  | 24.50%

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