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Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2021
Stock Options
Stock Options Outstanding, Beginning Balance	34,413,889
Stock Options, Granted	12,521,501
Stock Options, Exercised	(776,449)
Stock Options, Canceled or forfeited	(2,597,874)
Stock Options Outstanding, Ending Balance	43,561,067
Stock Options Exercisable	24,397,665
Weighted-Average Exercise Price per Share
Weighted-Average Exercise Price per Share Outstanding, Beginning Balance	$ 3.33
Weighted-Average Exercise Price per Share, Granted	9.00
Weighted-Average Exercise Price per Share, Exercised	2.63
Weighted-Average Exercise Price per Share, Cancelled or forfeited	4.00
Weighted-Average Exercise Price per Share Outstanding, Ending Balance	4.93
Weighted-Average Exercise Price Per Share Exercisable	$ 3.29
Weighted-Average Remaining Contractual Life (years)
Weighted-Average Remaining Contractual Life (years), Outstanding	7 years 11 months 19 days
Weighted-Average Remaining Contractual Life (years), Exercisable	7 years 2 months 1 day
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding	$ 432,916
Aggregate Intrinsic Value, Exercisable	$ 280,840

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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