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Common Stock - Summary of Common Stock and Reserved for Future Issuance (Details) - shares | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Summary of Common Stock Shares Authorized Issued Outstanding and Reserved for Future Issuance [Line Items] |  |  |
Shares Authorized | 1,700,000,000 | 429,600,000 |
Issued and Outstanding Shares |  | 226,364,401 |
Options Available for Future Grants |  | 203,235,599 |
Common Stock A |  |  |
Summary of Common Stock Shares Authorized Issued Outstanding and Reserved for Future Issuance [Line Items] |  |  |
Shares Authorized | 1,500,000,000 | 386,400,000 | 360,000,000
Issued and Outstanding Shares |  | 183,800,251 |
Options Available for Future Grants |  | 202,599,749 |
Common Stock F |  |  |
Summary of Common Stock Shares Authorized Issued Outstanding and Reserved for Future Issuance [Line Items] |  |  |
Shares Authorized |  | 43,200,000 |
Issued and Outstanding Shares |  | 42,564,150 |
Options Available for Future Grants |  | 635,850 |

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- Definition Summary of common stock shares authorized, issued, outstanding and reserved for future issuance. + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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