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Summary of Significant Accounting Policies - Reconciliation of Net Loss per Common Share (Details) - USD ($) | 3 Months Ended | 4 Months Ended | 6 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 | Dec. 31, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net loss | $ (3,786,000) |  |  | $ (2,192,000) | $ (6,093,000) | $ (13,624,000) |  |  | $ (15,735,000) | $ (21,909,000) | $ 10,336,000 | $ (37,192,000) | $ (77,535,000)
Adjusted net loss | (3,786,000) |  |  | (2,192,000) |  |  |  |  | (15,735,000) | (21,909,000) |  | (37,192,000) | (77,535,000)
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (3,786,000) |  |  | (2,192,000) | $ (6,093,000) | $ (13,624,000) |  |  | (15,735,000) | (21,909,000) | $ 10,336,000 | (37,192,000) | (77,535,000)
Net Income (Loss) Available to Common Stockholders, Basic, Total | (3,786,000) |  |  | $ (2,192,000) |  |  |  |  | (15,735,000) | $ (21,909,000) |  | $ (37,192,000) | $ (77,535,000)
890 5TH AVENUE PARTNERS, INC. |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (414,330) | $ (4,301,444) | $ 1,040,995 |  |  |  | $ (11,306) | $ (3,260,449) | (3,674,779) |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (414,330) | $ (4,301,444) | $ 1,040,995 |  |  |  | $ (11,306) | $ (3,260,449) | (3,674,779) |  |  |  |
Class A Common Stock | 890 5TH AVENUE PARTNERS, INC. |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted net loss | (333,219) |  |  |  |  |  |  |  | (2,930,445) |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Basic, Total | $ (333,219) |  |  |  |  |  |  |  | $ (2,930,445) |  |  |  |

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