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Stock-based Compensation - Schedule of Stock Options Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Jul. 30, 2021
Schedule Of Share Based Compensation Stock Options Activity [Line Items]
Number of Options, Beginning Balance	15,235
Number of Options, Granted	971
Number of Options, Exercised	(456)
Number of Options, Cancelled/forfeited	(84)
Number of Options, Ending Balance	15,666	15,235
Number of Options, Vested and expected to vest at June 30, 2021			15,628
Number of Options, Exercisable			5,637
Weighted-Average Exercise Price, Beginning Balance	$ 8.78
Weighted-Average Exercise Price, Granted	28.00
Weighted-Average Exercise Price, Exercised	0.63
Weighted-Average Exercise Price, Cancelled/forfeited	4.81
Weighted-Average Exercise Price, Ending Balance	$ 10.23	$ 8.78
Weighted-Average Exercise Price, Vested and expected to vest at June 30, 2021			$ 10.24
Weighted-Average Exercise Price, Exercisable			$ 7.99
Weighted-Average Remaining Contractual Life (in Years)	8 years 4 months 24 days	8 years 8 months 12 days
Weighted-Average Remaining Contractual Life (in Years), Vested and expected to vest at June 30, 2021	8 years 4 months 24 days
Weighted-Average Remaining Contractual Life (in Years), Exercisable	7 years 8 months 12 days
Aggregate Intrinsic Value	$ 432,727	$ 15,873
Aggregate Intrinsic Value, Vested and expected to vest at June 30, 2021			$ 431,496
Aggregate Intrinsic Value, Exercisable at June 30, 2021			$ 168,307

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Schedule of share based compensation stock options activity.

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

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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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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 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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