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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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