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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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