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Basis of Presentation and Summary of Significant Accounting Policies - Restatement of the financial statements (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 | Sep. 08, 2020 | Dec. 31, 2017
Unaudited Condensed Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | $ 329,832,000 |  |  |  |  |  | $ 279,192,000 |  | $ 329,832,000 |  | $ 279,192,000 | $ 245,129,000 |  |  |
Total Liabilities |  | 100,510,000 |  |  |  |  |  | 97,310,000 |  | 100,510,000 |  | 97,310,000 | 73,635,000 |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  | 97,683,000 |  |  |  |  |  | 37,190,000 |  | 97,683,000 |  | 37,190,000 | 35,842,000 |  |  |
Accumulated deficit |  | (362,553,000) |  |  |  |  |  | (346,818,000) |  | (362,553,000) |  | (346,818,000) | (357,154,000) |  |  |
Total stockholder's equity (deficit) |  | (268,782,000) |  |  |  |  |  | (313,803,000) |  | (268,782,000) |  | (313,803,000) | (323,371,000) | $ (290,050,000) |  | $ (216,959,000)
Total Liabilities, Class A Common Stock Subject to Possible Redemption and Stockholders' Equity (Deficit) |  | 329,832,000 |  |  |  |  |  | 279,192,000 |  | 329,832,000 |  | 279,192,000 | 245,129,000 |  |  |
Unaudited Condensed Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |
Weighted average shares outstanding, basic |  | 60,840 |  |  | 39,043 |  |  |  |  | 57,072 | 39,009 | 39,027 | 38,571 | 37,856 |  |
Weighted average shares outstanding, diluted |  | 60,840 |  |  | 39,043 |  |  |  |  | 57,072 | 39,009 | 39,027 | 38,571 | 37,856 |  |
Basic net loss per share |  | $ (0.06) |  |  | $ (0.06) |  |  |  |  | $ (0.28) | $ (0.56) | $ 0.00 | $ (0.96) | $ (2.05) |  |
Diluted net loss per share |  | $ (0.06) |  |  | $ (0.06) |  |  |  |  | $ (0.28) | $ (0.56) | $ 0.00 | $ (0.96) | $ (2.05) |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | $ 1,000 |  |  |  |  |  | 1,000 |  | $ 1,000 |  | $ 1,000 | $ 1,000 |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | 3,000 |  |  |  |  |  | 3,000 |  | 3,000 |  | 3,000 | $ 3,000 |  |  |
890 5TH AVENUE PARTNERS, INC. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unaudited Condensed Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 288,120,635 |  |  |  |  |  | 547,394 |  | 288,120,635 |  | 547,394 |  |  |  |
Total Liabilities |  | 13,903,377 |  |  |  |  |  | 533,700 |  | 13,903,377 |  | 533,700 |  |  |  |
Class A common stock subject to possible redemption |  | 287,500,000 |  |  |  |  |  |  |  | 287,500,000 |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  |  |  |  |  |  |  | 24,281 |  |  |  | 24,281 |  |  |  |
Accumulated deficit |  | (13,283,539) |  |  |  |  |  | (11,306) |  | (13,283,539) |  | (11,306) |  |  |  |
Total stockholder's equity (deficit) |  | (13,282,742) | $ (12,868,412) | $ (8,566,968) |  |  |  | 13,694 | $ (12,868,412) | (13,282,742) |  | 13,694 |  |  | $ 0 |
Total Liabilities, Class A Common Stock Subject to Possible Redemption and Stockholders' Equity (Deficit) |  | 288,120,635 |  |  |  |  |  | 547,394 |  | 288,120,635 |  | 547,394 |  |  |  |
Supplemental disclosure of noncash activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of Class A common stock subject to redemption amount |  |  |  | 17,105,848 |  |  |  |  | 17,105,848 | 17,105,848 |  |  |  |  |  |
Unaudited Condensed Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | (414,330) | (4,301,444) | 1,040,995 |  |  |  | $ (11,306) | (3,260,449) | (3,674,779) |  |  |  |  |  |
Weighted average shares outstanding, basic | [1] |  |  |  |  |  |  | 6,250,000 |  |  |  |  |  |  |  |
Weighted average shares outstanding, diluted |  |  |  |  |  |  |  | 6,250,000 |  |  |  |  |  |  |  |
Basic net loss per share |  |  |  |  |  |  |  | $ 0.00 |  |  |  |  |  |  |  |
Diluted net loss per share |  |  |  |  |  |  |  | $ 0.00 |  |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unaudited Condensed Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  | 288,690,246 | 288,953,438 |  |  |  |  | 288,690,246 |  |  |  |  |  |  |
Total Liabilities |  |  | 14,058,658 | 10,020,406 |  |  |  |  | 14,058,658 |  |  |  |  |  |  |
Class A common stock subject to possible redemption |  |  | 269,631,580 | 273,933,030 |  |  |  |  | 269,631,580 |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  |  | 8,270,788 | 3,969,381 |  |  |  |  | 8,270,788 |  |  |  |  |  |  |
Accumulated deficit |  |  | (3,271,755) | 1,029,689 |  |  |  |  | (3,271,755) |  |  |  |  |  |  |
Total stockholder's equity (deficit) |  |  | 5,000,008 | 5,000,002 |  |  |  |  | 5,000,008 |  |  |  |  |  |  |
Total Liabilities, Class A Common Stock Subject to Possible Redemption and Stockholder's Equity (Deficit) |  |  |  | 288,953,438 |  |  |  |  |  |  |  |  |  |  |  |
Total Liabilities, Class A Common Stock Subject to Possible Redemption and Stockholders' Equity (Deficit) |  |  | 288,690,246 |  |  |  |  |  | 288,690,246 |  |  |  |  |  |  |
Supplemental disclosure of noncash activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial value of Class A common stock subject to possible redemption |  |  |  | 284,058,140 |  |  |  |  | 272,650,670 |  |  |  |  |  |  |
Change in value of Class A common stock subject to possible redemption |  |  |  | (10,125,110) |  |  |  |  | (3,019,090) |  |  |  |  |  |  |
Unaudited Condensed Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | (4,301,444) | 1,040,995 |  |  |  |  | (3,260,449) |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unaudited Condensed Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A common stock subject to possible redemption |  |  | 17,868,420 | 13,566,970 |  |  |  |  | 17,868,420 |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  |  | (8,270,788) | (3,969,381) |  |  |  |  | (8,270,788) |  |  |  |  |  |  |
Accumulated deficit |  |  | (9,597,454) | (9,597,454) |  |  |  |  | (9,597,454) |  |  |  |  |  |  |
Total stockholder's equity (deficit) |  |  | (17,868,420) | (13,566,970) |  |  |  |  | (17,868,420) |  |  |  |  |  |  |
Supplemental disclosure of noncash activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial value of Class A common stock subject to possible redemption |  |  |  | (284,058,140) |  |  |  |  | (272,650,670) |  |  |  |  |  |  |
Change in value of Class A common stock subject to possible redemption |  |  |  | 10,125,110 |  |  |  |  | 3,019,090 |  |  |  |  |  |  |
Accretion of Class A common stock subject to redemption amount |  |  |  | 17,105,848 |  |  |  |  | 17,105,848 |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | As Restated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unaudited Condensed Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  | 288,690,246 | 288,953,438 |  |  |  |  | 288,690,246 |  |  |  |  |  |  |
Total Liabilities |  |  | 14,058,658 | 10,020,406 |  |  |  |  | 14,058,658 |  |  |  |  |  |  |
Class A common stock subject to possible redemption |  |  | 287,500,000 | 287,500,000 |  |  |  |  | 287,500,000 |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  | (12,869,209) | (8,567,765) |  |  |  |  | (12,869,209) |  |  |  |  |  |  |
Total stockholder's equity (deficit) |  |  | (12,868,412) | (8,566,968) |  |  |  |  | (12,868,412) |  |  |  |  |  |  |
Total Liabilities, Class A Common Stock Subject to Possible Redemption and Stockholder's Equity (Deficit) |  |  |  | 288,953,438 |  |  |  |  |  |  |  |  |  |  |  |
Total Liabilities, Class A Common Stock Subject to Possible Redemption and Stockholders' Equity (Deficit) |  |  | $ 288,690,246 |  |  |  |  |  | $ 288,690,246 |  |  |  |  |  |  |
Supplemental disclosure of noncash activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of Class A common stock subject to redemption amount |  |  |  | $ 17,105,848 |  |  |  |  |  |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | $ 78 |  |  |  |  |  |  |  | $ 78 |  |  |  |  |  |
Unaudited Condensed Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding, basic |  | 29,527,500 | 29,527,500 | 25,262,417 |  |  |  |  | 27,406,740 | 28,121,429 |  |  |  |  |  |
Weighted average shares outstanding, diluted |  | 29,527,500 | 29,527,500 | 25,262,417 |  |  |  |  | 27,406,740 | 28,121,429 |  |  |  |  |  |
Basic net loss per share |  | $ (0.01) | $ (0.12) | $ 0.03 |  |  |  |  | $ (0.09) | $ (0.10) |  |  |  |  |  |
Diluted net loss per share |  | $ (0.01) | $ (0.12) | $ 0.03 |  |  |  |  | $ (0.09) | $ (0.10) |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Class A Common Stock | As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  | $ 256 | $ 213 |  |  |  |  | $ 256 |  |  |  |  |  |  |
Unaudited Condensed Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding, basic |  |  | 27,388,576 | 23,328,204 |  |  |  |  | 27,332,731 |  |  |  |  |  |  |
Weighted average shares outstanding, diluted |  |  | 27,388,576 | 23,328,204 |  |  |  |  | 27,332,731 |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Class A Common Stock | Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  | $ (178) | $ (135) |  |  |  |  | $ (178) |  |  |  |  |  |  |
Unaudited Condensed Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding, basic |  |  | 2,138,924 | 1,934,212 |  |  |  |  | 74,009 |  |  |  |  |  |  |
Weighted average shares outstanding, diluted |  |  | 2,138,924 | 1,934,212 |  |  |  |  | 74,009 |  |  |  |  |  |  |
Basic net loss per share |  |  | $ (0.12) | $ 0.03 |  |  |  |  | $ (0.09) |  |  |  |  |  |  |
Diluted net loss per share |  |  | $ (0.12) | $ 0.03 |  |  |  |  | $ (0.09) |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Class A Common Stock | As Restated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  | $ 78 | $ 78 |  |  |  |  | $ 78 |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Class F Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock | [2] | $ 719 |  |  |  |  |  | $ 719 |  | $ 719 |  | $ 719 |  |  |  |
Unaudited Condensed Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding, basic |  | 7,187,500 | 7,187,500 | 7,052,083 |  |  |  |  | 7,120,166 | 7,142,857 |  |  |  |  |  |
Weighted average shares outstanding, diluted |  | 7,187,500 | 7,187,500 | 7,187,500 |  |  |  |  | 7,120,166 | 7,142,857 |  |  |  |  |  |
Basic net loss per share |  | $ (0.01) | $ (0.12) | $ 0.03 |  |  |  |  | $ (0.09) | $ (0.10) |  |  |  |  |  |
Diluted net loss per share |  | $ (0.01) | $ (0.12) | $ 0.03 |  |  |  |  | $ (0.09) | $ (0.10) |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Class F Common Stock | As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  | $ 719 | $ 719 |  |  |  |  | $ 719 |  |  |  |  |  |  |
Unaudited Condensed Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding, basic |  |  | 9,326,424 | 8,986,296 |  |  |  |  | 9,157,299 |  |  |  |  |  |  |
Weighted average shares outstanding, diluted |  |  | 9,326,424 | 8,986,296 |  |  |  |  | 9,157,299 |  |  |  |  |  |  |
Basic net loss per share |  |  | $ (0.46) | $ 0.12 |  |  |  |  | $ (0.36) |  |  |  |  |  |  |
Diluted net loss per share |  |  | $ (0.46) | $ 0.12 |  |  |  |  | $ (0.36) |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Class F Common Stock | Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unaudited Condensed Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding, basic |  |  | (2,138,924) | (1,934,212) |  |  |  |  | (2,037,133) |  |  |  |  |  |  |
Weighted average shares outstanding, diluted |  |  | (2,138,924) | (1,798,796) |  |  |  |  | (2,037,133) |  |  |  |  |  |  |
Basic net loss per share |  |  | $ 0.34 | $ (0.08) |  |  |  |  | $ 0.27 |  |  |  |  |  |  |
Diluted net loss per share |  |  | $ 0.34 | $ (0.08) |  |  |  |  | $ 0.27 |  |  |  |  |  |  |
890 5TH AVENUE PARTNERS, INC. | Class F Common Stock | As Restated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder's Equity (Deficit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  | $ 719 | $ 719 |  |  |  |  | $ 719 |  |  |  |  |  |  |
[1] | This number excludes an aggregate of up to 937,500 shares of common stock subject to forfeiture if the over-allotment option is not exercised in full or in part by the underwriters. On January 14, 2021, the over-allotment option was exercised in full. Accordingly, none of these shares were forfeited.
[2] | As of December 31, 2020, includes up to 937,500 shares of Class F common stock subject to forfeiture if the over-allotment option was not exercised in full or in part by the underwriters. On January 14, 2021, the over-allotment option was exercised in full. Thus, none of these shares were forfeited.

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- Definition Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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