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Stock-Based Awards - Summary of Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Number of Options
Beginning balance (in shares) | shares	12,959,926
Granted (in shares) | shares	1,944,717
Exercised (in shares) | shares	(831,207)
Forfeited (in shares) | shares	(259,060)
Ending balance (in shares) | shares	13,814,376
Vested and expected to vest (in shares) | shares	12,078,689
Exercisable (in shares) | shares	7,856,046
Weighted-Average Exercise Price
Beginning balance (usd per share) | $ / shares	$ 16.31
Granted (usd per share) | $ / shares	73.31
Exercised (usd per share) | $ / shares	14.27
Forfeited (usd per share) | $ / shares	34.89
Ending balance (usd per share) | $ / shares	24.11
Vested and expected to vest (usd per share) | $ / shares	27.48
Exercisable (usd per share) | $ / shares	$ 15.22

X

- Definition

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 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.

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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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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for 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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. 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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