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Stock-based Compensation - Schedule of Stock Options Activity (Detail) $ / shares in Units, shares in Thousands, $ 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 (in shares) | shares	15,235
Granted (in shares) | shares	971
Exercised (in shares) | shares	(539)
Cancelled/forfeited (in shares) | shares	(95)
Ending Balance (in shares) | shares	15,572	15,235
Vested and expected to vest at end of period (in shares) | shares	15,544
Exercisable at end of period (in shares) | shares	6,501
Weighted-Average Exercise Price
Beginning Balance (in dollars per share) | $ / shares	$ 8.78
Granted (in dollars per share) | $ / shares	28.00
Exercised (in dollars per share) | $ / shares	0.71
Cancelled/forfeited (in dollars per share) | $ / shares	4.40
Ending Balance (in dollars per share) | $ / shares	10.28	$ 8.78
Vested and expected to vest at end of period (in dollars per share) | $ / shares	10.29
Exercisable at end of period (in dollars per share) | $ / shares	$ 8.31
Weighted Average Remaining Contractual Life (in Years)	8 years 2 months 12 days	8 years 8 months 12 days
Vested and expected to vest at end of period, term	8 years 2 months 12 days
Exercisable at end of period, term	7 years 7 months 6 days
Aggregate Intrinsic Value | $	$ 252,542	$ 15,873
Vested and expected to vest at September 30, 2021 | $	251,962
Exercisable at September 30, 2021 | $	$ 117,605

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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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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 option holders acquired shares when converting their stock options into shares.

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