Stock-based Compensation - Summary of Stock Option Activity (Details)	3 Months Ended
Mar. 31, 2021 $ / shares shares
Compensation Related Costs [Abstract]
Number of stock options, Outstanding as of December 31, 2020 \| shares	5,029,364
Number of stock options, Granted \| shares	1,001,054
Number of stock options, Exercised \| shares	(49,328)
Number of stock options, Cancelled or forfeited \| shares	(28,176)
Number of stock options, Outstanding as of March 31, 2021 \| shares	5,952,914
Number of stock options, Options exercisable as of March 31,2021 \| shares	531,248
Number of stock options, Vested and expected to vest as of March 31, 2021 \| shares	5,952,914
Weighted-average exercise price, Outstanding as of December 31, 2020 \| $ / shares	$ 12.72
Weighted-average exercise price, Granted \| $ / shares	44.48
Weighted-average exercise price, Exercised \| $ / shares	3.36
Weighted-average exercise price, Cancelled or forfeited \| $ / shares	21.23
Weighted-average exercise price, Outstanding as of March 31, 2021 \| $ / shares	18.10
Weighted-average exercise price, Options exercisable as of March 31, 2021 \| $ / shares	4.47
Weighted-average exercise price, Vested and expected to vest as of March 31, 2021 \| $ / shares	$ 18.10

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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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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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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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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for 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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Number of share options (or share units) exercised during the current period.

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