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Stock-Based Compensation - Compensation Related Costs Share based Payments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Jan. 01, 2022
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares issued on common stock outstanding	4.00%
Number of shares available for future grant	752,054		1,318,271
Stock option expiration period	10 years
2018 Plan \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share of stock options as percentage of fair market value of common stock	100.00%
Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock- based compensation expense	$ 846	$ 989
Plans \| Options to Purchase Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Granted	1,473,150	1,087,456
Stock- based compensation expense	$ 844	$ 839
Weighted-average grant-date fair values of options granted	$ 0.46	$ 5.16
Unrecognized compensation cost, recognized cost	2 years 8 months 19 days
Unrecognized compensation cost	$ 7,985
Option outstanding	5,635,975
Plans \| Unvested Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option outstanding	3,513,828
Plans \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock- based compensation expense		$ 30
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0
Stock options outstanding, unvested	0
Plans \| Restricted Stock Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock- based compensation expense	$ 2	$ 120
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0	5,939
Stock options outstanding, unvested	0
Plans \| Maximum [Member] \| Non Statutory Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period	4 years
Plans \| Minimum [Member] \| Non Statutory Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period	1 year