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Investments and Fair Value Measurement - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Investments [Line Items]          
Investments $ 3,000,000   $ 3,000,000    
Cash and cash equivalents 7,617,000 $ 13,265,000 7,617,000 $ 13,265,000 $ 15,301,000
Fair value of investment in equity securities 0   0    
Interest income on investments in debt securities 100,000   100,000    
(Loss) gain on investment in equity securities $ 0 $ (70,000) 12,000 $ (75,000)  
Liquidation of equity securities     700,000    
Maximum [Member]          
Investments [Line Items]          
(Loss) gain on investment in equity securities     $ 100,000