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Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Redeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ 1,503 | $ 908 | $ 848 | $ 734 | $ 411 | $ 28 | $ 848 | $ 28 | $ 28 |  |
Allocation of net (income) loss | 67 | 85 | 60 | 62 | 323 | 383 | 212 | 768 | 820 | $ 273 | $ (971)
Ending balance | $ 1,570 | $ 1,503 | 908 | $ 796 | $ 734 | 411 | 1,570 | 796 | $ 848 | 28 |
BuzzFeed Japan |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership (In percentage) |  |  |  |  |  |  |  |  | 49.00% |  |
Redeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  | $ 848 |  |  | $ 28 | $ 848 | $ 28 | $ 28 | (245) | 726
Allocation of net (income) loss |  |  |  |  |  |  |  |  | 820 | 273 | (971)
Ending balance |  |  |  |  |  |  |  |  | $ 848 | $ 28 | $ (245)

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- Definition Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764 + Details
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