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Stock-Based Compensation - Summary of Activity Related to Stock Option Grants (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Subject to Options Outstanding, Beginning balance	6,316,569
Shares Subject to Options Outstanding, Granted	328,873
Shares Subject to Options Outstanding, Exercised	(165,331)
Shares Subject to Options Outstanding, Cancelled	(12,604)
Shares Subject to Options Outstanding, Ending balance	6,467,507	6,316,569
Shares Subject to Options Outstanding Vested, Ending balance	1,156,286
Weighted- Average Exercise Price, Beginning balance	$ 10.93
Weighted- Average Exercise Price, Granted	39.02
Weighted- Average Exercise Price, Exercised	2.86
Weighted- Average Exercise Price, Cancelled	13.81
Weighted- Average Exercise Price, Ending balance	12.56	$ 10.93
Weighted- Average Exercise Price Vested, Ending balance	$ 8.00
Weighted- Average Remaining Contractual Life (Years)	9 years 14 days	9 years 6 months
Weighted- Average Remaining Contractual Life (Years), Vested	8 years 7 months 6 days
Aggregate Intrinsic Value, Beginning balance	$ 223,647
Aggregate Intrinsic Value, Exercised	4,634
Aggregate Intrinsic Value, Ending balance	121,425	$ 223,647
Aggregate Intrinsic Value, Vested Ending balance	$ 26,546

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Weighted average price at which option holders cancelled shares when converting their stock options into shares.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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Amount by which current fair value of underlying stock exceeds exercise price of 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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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 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 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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