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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options, Outstanding	2,117,106
Number of Options, Granted	1,098,542
Number of Options, Exercised	(53,134)
Forfeited and Canceled	(406,412)
Number of Options, Outstanding	2,756,102	2,117,106
Number of Options, Options Exercisable	1,925,666
Weighted Average Exercise Price, Outstanding	$ 2.52
Weighted Average Exercise Price, Granted	16.88
Weighted Average Exercise Price, Exercised	1.47
Forfeited and Canceled	2.38
Weighted Average Exercise Price, Outstanding	8.28	$ 2.52
Weighted Average Exercise Price, Options Exercisable	$ 3.00
Weighted Average Remaining Contractual Term, Outstanding	8 years 7 months 6 days	8 years 8 months 12 days
Weighted Average Remaining Contractual Term, Options Exercisable	8 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding	$ 57,090	$ 2,825
Aggregate Intrinsic Value, Options Exercisable	$ 50,109

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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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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 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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