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Summary of Stock-Based Compensation Expense Recognized (Parenthetical) (Detail) - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of shares of common stock issued to certain board members in lieu of cash compensation	15,961	39,823

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- Definition

Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

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