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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Amount of noncash expense for share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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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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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of options vested.

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Stockholders' Equity - Narrative (Detail) - USD ($)		3 Months Ended			9 Months Ended		12 Months Ended
Stockholders' Equity - Narrative (Detail) - USD ($)	Feb. 16, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Class of Stock [Line Items]
Common stock, shares authorized (in shares)		1,000,000,000			1,000,000,000		1,000,000,000
Common stock, par value (in dollars per share)		$ 0.0001			$ 0.0001		$ 0.0001
Preferred stock, shares authorized (in shares)		10,000,000			10,000,000		10,000,000
Common stock, voting rights					one
Common stock, shares outstanding (in shares)		136,754,685			136,754,685		70,266,925
Stock options available for grant (in shares)		10,527,368			10,527,368		10,244,399
Stock options, exercisable (in shares)		3,808,472			3,808,472		2,150,941
Stock option, aggregate intrinsic value		$ 47,014,274			$ 47,014,274
Stock-based compensation					4,808,000	$ 78,000
Stock compensation not yet recognized		$ 7,300,000			$ 7,300,000
Stock compensation not yet recognized, vesting period					4 years
Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)		1,010,000,000			1,010,000,000
Common stock, par value (in dollars per share)		$ 0.0001			$ 0.0001
Warrants issued (in shares)					1,000,000,000
Common stock, shares outstanding (in shares)		136,754,685			136,754,685		70,266,925
General and administrative expense
Class of Stock [Line Items]
Stock-based compensation		$ 600,000		$ 100,000	$ 4,800,000	$ 100,000
Research and development expense
Class of Stock [Line Items]
Stock-based compensation		$ 200,000		$ 0
Performance and market based awards
Class of Stock [Line Items]
Stock options issued during the period (in shares)							2,920,732
Stock options, vested (in shares)	529,119
Stock-based compensation					$ 2,900,000
Performance and market based awards \| First vesting
Class of Stock [Line Items]
Stock option plan, vesting percentage			2.0833%
Stock options, outstanding (in shares)			529,119
Performance and market based awards \| Second vesting
Class of Stock [Line Items]
Stock options, outstanding (in shares)		2,391,613			2,391,613
Stock Plan
Class of Stock [Line Items]
Common stock, shares reserved (in shares)		18,467,109			18,467,109
Stock option plan, exercisable period					4 years
Stock Plan \| Share-based payment arrangement, nonemployee
Class of Stock [Line Items]
Stock option plan, exercisable period					10 years
Stock Plan \| One year from the vesting commencement date
Class of Stock [Line Items]
Stock option plan, vesting percentage					25.00%
Option vesting period					1 year
Stock Plan \| More than one year from vesting commencement date
Class of Stock [Line Items]
Stock option plan, vesting percentage					2.778%