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Redeemable Convertible Preferred Stock and Stockholders’ Equity - Additional Information (Details) |  |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 28, 2021 shares | Mar. 15, 2021 | Mar. 03, 2021 | Dec. 19, 2019 | Sep. 30, 2021 vote $ / shares shares | Dec. 31, 2020 vote $ / shares shares | Dec. 31, 2019 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |
Redeemable convertible preferred stock, authorized (in shares) | 9,898,400 |  |  |  |  |  |
Preferred stock, conversion ratio | 3 |  |  |  |  |  |
Conversion of preferred stock (in shares) | 29,695,200 |  |  |  |  |  |
Common stock, authorized (in shares) |  |  |  |  | 0 | 300,000,000 | 300,000,000
Common stock, par value (in USD per share) | $ / shares |  |  |  |  | $ 0.00001 | $ 0.00001 | $ 0.00001
Preferred stock, authorized (in shares) |  |  |  |  | 100,000,000 | 9,898,400 | 9,898,400
Preferred stock, par value (in USD per share) | $ / shares |  |  |  |  | $ 0.00001 | $ 0.00001 | $ 0.00001
Percentage of votes required |  |  | 0.6666 |  | 0.6666 |  |
Anniversary of effectiveness |  |  |  |  | 7 years |  |
Percentage of outstanding shares |  |  |  |  | 0.10 |  |
Stock split, conversion ratio |  | 3 |  | 100 |  |  |
Series A redeemable convertible preferred stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Redeemable convertible preferred stock, authorized (in shares) | 3,379,400 |  |  |  | 0 | 3,379,400 |
Series A-1 redeemable convertible preferred stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Redeemable convertible preferred stock, authorized (in shares) | 1,837,600 |  |  |  | 0 | 1,837,600 | 1,837,600
Series B convertible preferred stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Redeemable convertible preferred stock, authorized (in shares) | 4,681,400 |  |  |  |  |  |
Preferred stock, authorized (in shares) |  |  |  |  | 0 | 4,681,400 | 4,681,400
Preferred stock, par value (in USD per share) | $ / shares |  |  |  |  | $ 0.00001 | $ 0.00001 | $ 0.00001
Common Class A |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, authorized (in shares) |  |  |  |  | 1,000,000,000 | 0 |
Common stock, par value (in USD per share) | $ / shares |  |  |  |  | $ 0.00001 | $ 0.00001 |
Number of votes per share of stock held | vote |  |  |  |  | 1 | 1 |
Number of shares issued in conversion (in shares) |  |  |  |  | 1 |  |
Common Class B |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, authorized (in shares) |  |  |  |  | 160,000,000 | 0 |
Common stock, par value (in USD per share) | $ / shares |  |  |  |  | $ 0.00001 | $ 0.00001 |
Number of votes per share of stock held | vote |  |  |  |  | 10 |  |
Number of shares issued in conversion (in shares) |  |  |  |  | 1 |  |

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- Definition The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + 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(27)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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