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Stockholders' Equity (Deficit) - Additional Information (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 shares | Sep. 30, 2020 USD ($) $ / shares shares | Jul. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) Vote $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2014 $ / shares shares | Jun. 24, 2021 shares
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  | 10,000,000 | 0 |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  |  |  | $ 0.00001 | $ 0.00001 |  |  |
Common Stock, Shares Authorized |  |  |  | 0 | 323,000,000 |  |  |
Conversion, percent threshold |  |  |  | 10.00% |  |  |  |
Redeemable Convertible Preferred Stock, Shares Outstanding |  |  |  | 0 | 115,277,850 |  |  |
Redeemable Convertible Preferred Stock, Shares Issued |  |  |  | 0 | 115,277,850 |  |  |
Common stock charitable donation expense | $ |  |  |  | $ 13,290 | $ 0 | $ 0 |  |
Common Stock, Par Value | $ / shares |  |  |  | $ 0.00001 | $ 0.00001 |  |  |
Common stock reserved for issuance (in shares) |  |  |  | 106,320,711 | 191,849,299 |  |  |
Intrinsic value of options exercised | $ |  |  |  | $ 976,500 | $ 60,800 | $ 16,300 |  |
Weighted average grant date fair value per share of options granted | $ / shares |  |  |  | $ 12.43 | $ 4.43 | $ 1.80 |  |
Grant-date fair value of stock options vested | $ |  |  |  | $ 63,600 | $ 29,200 | $ 15,400 |  |
Shares early exercised and repurchase |  |  |  | 2,164,577 | 2,338,945 |  |  |
Liabilities for early exercise of unvested stock options and other liabilities | $ |  |  |  | $ 15,800 | $ 6,900 |  |  |
Stock based compensation expense | $ |  |  |  | 155,624 | $ 143,341 | $ 18,617 |  |
Cumulative stock-based compensation expense | $ |  |  |  | $ 3,800 |  |  |  |
Expected dividend yield |  |  |  | 0.00% | 0.00% | 0.00% |  |
Unrecognized stock-based compensation expense | $ |  |  |  | $ 518,700 |  |  |  |
Unrecognized stock-based compensation expense, weighted-average period |  |  |  | 3 years 2 months 12 days |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock shares issued to founders |  |  |  |  |  |  | 71,280,000 |
Stock received after stock split |  |  |  |  |  |  | 23,760,000 |
Tender Offer [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Stock based compensation expense | $ |  |  |  |  | $ 76,300 |  |  |
Shares issued, price per share | $ / shares |  |  | $ 14.9687 |  |  |  |  |
Aggregate purchase price of stock issued | $ |  |  | $ 137,200 |  |  |  |  |
Tender Offer [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares sold in transaction |  |  | 1,883,233 |  |  |  |  |
Secondary Sales [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Stock based compensation expense | $ |  |  |  |  | $ 35,600 |  |  |
Secondary Sales [Member] | Director [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares sold in transaction |  | 2,632,747 |  |  |  |  |  |
Shares issued, price per share | $ / shares |  | $ 14.9687 |  |  |  |  |  |
Aggregate purchase price of stock issued | $ |  | $ 39,400 |  |  |  |  |  |
Secondary Sales [Member] | Director And Employee [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares sold in transaction |  | 2,142,900 |  |  |  |  |  |
Shares issued, price per share | $ / shares |  | $ 14.00 |  |  |  |  |  |
Aggregate purchase price of stock issued | $ |  | $ 30,000 |  |  |  |  |  |
Convertible Founder Stock [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Convertible Founder Stock, Shares Outstanding |  |  |  | 0 | 635,818 |  |  | 635,818
Convertible Founder Stock, Shares Issued |  |  |  | 0 | 635,818 |  | 7,920,000 |
Stock received after stock split |  |  |  |  |  |  | 2,640,000 |
Convertible founder stock (in shares) |  |  | 7,284,182 |  | (7,284,182) |  |  |
Common Stock, Par Value | $ / shares |  |  |  |  |  |  | $ 0.00001 |
Convertible Founder Stock [Member] | Tender Offer [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Convertible founder stock (in shares) |  |  | 7,284,182 |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  | 1,000,000,000 | 0 |  |  |
Common stock, voting rights, votes per share | Vote |  |  |  | 1 |  |  |  |
Number of new stock issued during the period | 250,000 |  |  |  |  |  |  |
Common stock charitable donation expense | $ |  |  |  | $ 13,290 |  |  |  |
Common Stock, Par Value | $ / shares |  |  |  | $ 0.00001 | $ 0.00001 |  |  |
Common Class B [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  | 500,000,000 | 0 |  |  |
Common stock, voting rights, votes per share | Vote |  |  |  | 10 |  |  |  |
Common Stock, Par Value | $ / shares |  |  |  | $ 0.00001 | $ 0.00001 |  |  |
Convertible preferred stock, shares issued upon conversion |  |  |  | 115,277,850 |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock, Shares Outstanding |  |  |  |  | 24,653,759 |  |  |
Redeemable Convertible Preferred Stock, Shares Issued |  |  |  |  | 24,653,759 |  |  |
Convertible founder stock (in shares) |  |  |  |  | 7,284,182 |  |  |
Series E Redeemable Convertible Preferred Stock [Member] | Tender Offer [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Convertible founder stock (in shares) |  |  | 7,284,182 |  |  |  |  |
2021 Plan [Member] | Common Class A [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  | 25,812,876 |  |  |  |
2021 Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  | 5,162,575 | 0 |  |  |
Expected dividend yield |  |  |  | 0.00% |  |  |  |
2021 Employee Stock Purchase Plan [Member] | Common Class A [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  | 5,162,575 |  |  |  |
Purchase price of common stock expressed as a percentage of its fair value |  |  |  | 85.00% |  |  |  |
Performance Based Vesting Condition [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Performance options, shares |  |  |  | 2,875,255 | 2,875,255 |  |  |
Service Based Vesting Condition [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Performance options, shares |  |  |  | 2,875,255 | 2,875,255 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Requisite period of common stock |  |  |  | 4 years |  |  |  |
Total grant-date fair value of RSUs vested | $ |  |  |  | $ 22,200 |  |  |  |
Service based vesting period |  |  |  | 4 years |  |  |  |
Stock based compensation expense | $ |  |  |  | $ 6,800 |  |  |  |

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- Definition Number of new stock issued during the period. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Number of shares issued during the period as a result of a stock split. + 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. 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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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. 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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