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Description of Business and Liquidity - Additional Information (Detail)
$ in Thousands
6 Months Ended
Sep. 30, 2023
USD ($)
segment
Mar. 31, 2023
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Number of reportable segments | segment 1  
Number of operating segments | segment 1  
Cash and cash equivalents | $ $ 269,928 $ 376,532
Accumulated deficit | $ $ 698,946 $ 566,347