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Stockholders' Equity - Stock-based Compensation Expense and Valuation Information - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2022 USD ($) Participant | Sep. 30, 2021 | Sep. 30, 2022 USD ($) Participant | Sep. 30, 2021
Class Of Stock [Line Items] |  |  |  |
Total unrecognized compensation cost related to unvested stock option grants | $ 3.4 |  | $ 3.4 |
Expected term | 6 years | 6 years | 6 years | 6 years
2016 Employee Stock Purchase Plan [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Expected term |  |  | 6 months |
Participants enrolled into the employee stock purchase plan | Participant | 1 |  | 1 |
Stock options [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Total unrecognized compensation cost related, weighted average period |  |  | 2 years 3 months 18 days |
Restricted stock units (RSUs) [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Total unrecognized compensation cost related, weighted average period |  |  | 2 years 4 months 17 days |
Unrecognized stock-based compensation expense | $ 0.1 |  | $ 0.1 |

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