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Summary of Stock-Based Compensation Expense Recognized (Parenthetical) (Detail) - shares | 3 Months Ended | 9 Months Ended
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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. + References No definition available. + Details
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