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+ References

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-Publisher FASB
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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No definition available.

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

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		6 Months Ended
	Aug. 31, 2020	Nov. 30, 2019	Jun. 30, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation related to unvested stock options			$ 9.2
Weighted-average stock option recognize period			2 years 7 months 2 days
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Granted			0
Stock vesting period		1 year
Restricted stock units outstanding			425,000	425,000
Total unrecognized compensation related to nonvested restricted stock units			$ 5.0
Restricted Stock Units (RSUs) [Member] \| Executive Officers [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Granted	250,000	300,000
Restricted Stock Units (RSUs) [Member] \| One Year Anniversary [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of stock subject to vesting (as a percent)	50.00%	50.00%
Restricted Stock Units (RSUs) [Member] \| New Drug Application [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of stock subject to vesting (as a percent)	50.00%	50.00%