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Stock Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Oct. 31, 2020	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Apr. 30, 2021
Share Based Payment Arrangement [Line Items]
Share based compensation arrangement by share based payment award, Options exercised in period, Total intrinsic value					$ 206
Stock-based compensation expense		$ 933		$ 55	$ 2,050	$ 188
Number of options, Granted				0
Employee Stock Purchase Plan ESPP [Member]
Share Based Payment Arrangement [Line Items]
Common stock capital, Shares reserved for future issuance							220,251
2021 Equity Incentive Plan [Member]
Share Based Payment Arrangement [Line Items]
Common stock capital, Shares reserved for future issuance							2,213,773
Share-based compensation arrangement by share-based payment award, Number of shares available for issuance		1,510,665			1,510,665
2017 and 2021 Amended Equity Incentive Plan [Member]
Share Based Payment Arrangement [Line Items]
Share based compensation arrangement by share based payment award, Options exercised in period, Total intrinsic value		$ 0
Share based compensation arrangement by share based payment award, Options granted in period, Weighted average grant date fair value		$ 9.94			$ 6.66
2017 and 2021 Amended Equity Incentive Plan [Member] | Unvested Stock Options And Restricted Stock Awards [Member]
Share Based Payment Arrangement [Line Items]
Share based compensation, Nonvested awards, Compensation cost not yet recognized Stock options and equity instruments other than options		$ 10,348			$ 10,348
Share based compensation, Nonvested awards, Compensation cost not yet recognized period of recognition stock options and equity instruments other than options					3 years 1 month 24 days
Restricted Stock [Member] | 2017 and 2021 Amended Equity Incentive Plan [Member]
Share Based Payment Arrangement [Line Items]
Share based compensation arrangement by share based payment award, Vesting period	1 year
Share based compensation arrangement by share based payment award, Equity instruments other than options nonvested, Weighted average Grant date fair value	$ 6.37
Stock-based compensation expense					$ 236
ESPP [Member]
Share Based Payment Arrangement [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock Percent of Fair Market Value					85.00%
Share purchases funded through payroll deductions for employee's eligible minimum annual compensation, percentage					1.00%
Share purchases funded through payroll deductions for employee's eligible maximum annual compensation, percentage		15.00%			15.00%
Potential increase in shares reserved for future issuance (in shares)					440,502
Potential increase in shares reserved for future issuance as percentage of outstanding share					1.00%
Number of shares issued under share-based payment arrangement					0
Common Class A [Member]
Share Based Payment Arrangement [Line Items]
Number of options, Granted			113,683
Common Class A [Member] | Restricted Stock [Member]
Share Based Payment Arrangement [Line Items]
Share based compensation arrangement by share based payment award, Restricted shares of fully issued and outstanding common stock	49,636

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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