Summary of Option Activity Under Company's Equity Incentive Plans (Detail) - $ / shares	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Number of Shares Underlying Outstanding Options
Number of Shares Underlying Outstanding Options, Beginning Balance	2,355,615
Number of Shares Underlying Outstanding Options, Options granted	939,613
Number of Shares Underlying Outstanding Options, Options forfeited	(87,083)
Number of Shares Underlying Outstanding Options, Ending Balance	3,208,145	2,355,615
Number of Shares Underlying Outstanding Options, Exercisable - March 31, 2020	1,213,061
Weighted- Average Exercise Price
Weighted- Average Exercise Price, Beginning Balance	$ 8.59
Weighted- Average Exercise Price, Options granted	6.21
Weighted- Average Exercise Price, Options forfeited	7.62
Weighted- Average Exercise Price, Ending Balance	7.92	$ 8.59
Weighted- Average Exercise Price, Exercisable - March 31, 2020	$ 10.18
Weighted-Average Remaining Contractual Term (Years)
Weighted-Average Remaining Contractual Term (Years), Outstanding Balance	8 years 4 months 13 days	7 years 11 months 15 days

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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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- Definition

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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Gross number of share options (or share units) granted during the period.

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No definition available.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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