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BALANCE SHEET (Parenthetical) - $ / shares | Sep. 30, 2021 | Jan. 14, 2021 | Dec. 31, 2020 | Oct. 31, 2020 | Dec. 31, 2019
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Class B Common Stock |  |  |  |  |
Common stock, par value | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001
Common shares, shares authorized | 500,000,000 |  | 500,000,000 |  | 500,000,000
Common shares, shares issued | 27,391,338 |  | 34,362,554 |  | 34,152,328
Common shares, shares outstanding | 27,143,111 |  | 34,114,327 |  | 33,904,101
Class F Common Stock | 890 5TH AVENUE PARTNERS, INC. |  |  |  |  |
Common stock, par value | $ 0.0001 |  | $ 0.0001 |  |
Common shares, shares authorized | 25,000,000 |  | 25,000,000 |  |
Common shares, shares issued | 7,187,500 |  | 7,187,500 | 7,187,500 |
Common shares, shares outstanding | 7,187,500 |  | 7,187,500 |  |
Maximum shares subject to forfeiture |  | 937,500 |  | 937,500 |
Class F Common Stock | Over-allotment option | 890 5TH AVENUE PARTNERS, INC. |  |  |  |  |
Maximum shares subject to forfeiture |  |  | 937,500 |  |
Common stock subject to redemption | Over-allotment option | 890 5TH AVENUE PARTNERS, INC. |  |  |  |  |
Maximum shares subject to forfeiture |  |  | 937,500 |  |

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