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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2021 | Mar. 31, 2021 | Jan. 14, 2021 | Oct. 31, 2020
Additional paid-in capital | $ 97,683,000 |  | $ 97,683,000 |  | $ 37,190,000 | $ 35,842,000 |  |  |  |  |
Accumulated deficit | (362,553,000) |  | (362,553,000) |  | (346,818,000) | (357,154,000) |  |  |  |  |
Unrecognized tax benefits | $ 0 |  | $ 0 |  | $ 0 | $ 0 |  |  |  |  |
Statutory tax rate (as a percent) | 21.00% | 21.00% | 21.00% | 21.00% | 21.00% | 21.00% | 21.00% |  |  |  |
890 5TH AVENUE PARTNERS, INC. |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  |  |  |  | $ 24,281 |  |  |  |  |  |
Accumulated deficit | $ (13,283,539) |  | $ (13,283,539) |  | (11,306) |  |  |  |  |  |
Cash FDIC insured amount | 250,000 |  | 250,000 |  |  |  |  |  |  |  |
Cash equivalents | $ 0 |  | $ 0 |  | 0 |  |  |  |  |  |
Anti-dilutive securities attributable to warrants (in shares) | 9,842,500 |  | 9,842,500 |  |  |  |  |  |  |  |
Unrecognized tax benefits | $ 0 |  | $ 0 |  | $ 0 |  |  |  |  |  |
Unrecognized tax benefits accrued for interest and penalties | 0 |  | 0 |  |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Adjustment |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  |  |  |  |  |  |  | $ (8,270,788) | $ (3,969,381) |  |
Accumulated deficit |  |  |  |  |  |  |  | $ (9,597,454) | $ (9,597,454) |  |
890 5TH AVENUE PARTNERS, INC. | Adjustment | Reclassification Of Common Stock Subject To Possible Redemption As Temporary Equity |  |  |  |  |  |  |  |  |  |  |
Minimum net intangible assets to be maintained on redemption of temporary equity | $ 5,000,001 |  | $ 5,000,001 |  |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |
Shares subject to forfeiture | 28,750,000 |  | 28,750,000 |  |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Class F Common Stock |  |  |  |  |  |  |  |  |  |  |
Shares subject to forfeiture |  |  |  |  |  |  |  |  |  |  | 937,500
890 5TH AVENUE PARTNERS, INC. | Class F Common Stock | Over-allotment option |  |  |  |  |  |  |  |  |  |  |
Shares subject to forfeiture |  |  |  |  |  |  |  |  |  | 937,500 |

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