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Stock-Based Compensation - Summary of Stock Options Activity Under 2018 Plan and 2015 Equity Incentive Plan (Details) - 2018 Plan and 2015 Equity Incentive Plan $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Number of Options
Beginning balance | shares	6,897,276
Granted | shares	1,478,994
Exercised | shares	(348,420)
Forfeited or canceled | shares	(228,118)
Ending balance | shares	7,799,732	6,897,276
Weighted Average Exercise Price
Beginning balance | $ / shares	$ 24.52
Granted | $ / shares	94.80
Exercised | $ / shares	17.06
Forfeited or canceled | $ / shares	41.86
Ending balance | $ / shares	$ 37.62	$ 24.52
Weighted Average Remaining Contractual Term (in years)
Weighted Average Remaining Contractual Term (in years)	7 years 8 months 26 days	8 years 25 days
Aggregate Intrinsic Value
Balance | $	$ 431,288	$ 841,704

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Share-based compensation arrangement by share-based payment award, options, weighted average remaining contractual term.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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

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