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Stockholders' Equity - Summary of Stock Option Award Activity (Details) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares
Weighted-Average Exercise Price |  |
Weighted-Average Exercise Price, Beginning balance | $ / shares | $ 10.37 |
Weighted-Average Exercise Price, Granted | $ / shares | 49.63 |
Weighted-Average Exercise Price, Exercised | $ / shares | 12.30 |
Weighted-Average Exercise Price, Forfeited | $ / shares | 13.53 |
Weighted-Average Exercise Price, Ending balance | $ / shares | $ 10.38 | $ 10.37
Weighted-Average Remaining Contractual Term |  |
Weighted-Average Remaining Contractual Term (in years) | 4 years 4 months 28 days | 5 years 2 months 12 days
Aggregate Intrinsic Value |  |
Aggregate Intrinsic Value, Outstanding | $ | $ 298,934 | $ 223,230
Class A Common Stock |  |
Number of Shares |  |
Number of Shares, Beginning balance | 4,828 |
Number of Shares, Granted | 48 |
Number of Shares, Exercised | (891) |
Number of Shares, Forfeited | (7) |
Number of Shares, Ending balance | 3,978 | 4,828
Class B Common Stock |  |
Number of Shares |  |
Number of Shares, Beginning balance | 796 |
Number of Shares, Exercised | (66) |
Number of Shares, Ending balance | 730 | 796

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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