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Investments - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Mar. 31, 2022
Investments [Line Items] |  |  |  |
Unrealized gains or losses on short-term investments | $ 0 | $ 0 |  |
Short-term investments | 9,955,000 | 9,955,000 |  | $ 0
Purchase of equity securities |  | 1,061,000 | $ 0 |
Sale of equity securities |  | 368,000 | $ 0 |
Fair value of investment in equity securities | 600,000 | 600,000 |  |
Unrealized loss on investment in equity securities |  | 100,000 |  |
Maximum [Member] |  |  |  |
Investments [Line Items] |  |  |  |
Interest income on short-term investments | 100,000 | 100,000 |  |
Three Month Treasury Bills [Member] |  |  |  |
Investments [Line Items] |  |  |  |
Short-term investments | $ 10,000,000.0 | $ 10,000,000.0 |  |

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