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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Summary Of Significant Accounting Policies [Line Items]      
Cash and cash equivalents $ 7,617,000 $ 13,265,000 $ 15,301,000
Restricted cash 143,000 143,000 143,000
Accumulated deficit (333,020,000)   $ (324,998,000)
Cash flow from operations $ 8,460,000 4,631,000  
Issuance of common stock 8,719,453   8,716,906
Dilutive effect $ 0 $ 0  
Common stock equivalents excluded from computing diluted net loss per share 1,000,000 1,400,000  
At-The-Market Facility [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Issuance of common stock 0