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Stockholders' Equity - Stock Options and Employee Stock Purchase Plan - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 07, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Class Of Stock [Line Items] |  |  |  |  |
Vesting criteria probability of achievement percentage |  |  |  | 0.00% |
Expense recorded |  |  |  | $ 0 |
Weighted-average remaining contractual term of stock options exercisable |  |  |  | 8 years 3 months 7 days |
Weighted-average remaining contractual term of stock options outstanding |  |  |  | 8 years 3 months 7 days |
Number of common stock shares approved under ESPP |  | 2,686,213 |  | 2,686,213 |
Expected term |  | 6 years | 6 years | 6 years | 6 years
2012 Plan [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Stock options granted |  | 126,262 |  | 199,921 |
2012 Plan [Member] | Executive Chairman [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Stock options granted | 30,000 |  |  |  |
2012 Plan [Member] | Chief Scientific Officer [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Stock options granted | 7,500 |  |  |  |
2016 Employee Stock Purchase Plan [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Number of common stock shares approved under ESPP |  | 75,000 |  | 75,000 |
Employee subscription rate |  | 15.00% |  | 15.00% |
Compensation amount per employee |  |  |  | $ 25,000 |
Number of shares per employee |  |  |  | 500 |
Fair market value at discount |  |  |  | 85.00% |
Purchase period |  |  |  | 6 months |
Initial offering period |  |  |  | 2016-09 |
Description of plan |  |  |  | Shares under the ESPP are purchased at 85 percent of the fair market value at the lower of (i) the closing price on the first trading day of the six-month purchase period or (ii) the closing price on the last trading day of the six-month purchase period. |
Expected term |  |  |  | 6 months |
Shares available for purchase under ESPP |  | 59,435 |  | 59,435 |

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