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Balance Sheet Components - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Balance Sheet Components [Line Items]      
Total accrued expenses $ 73,788 $ 76,936 $ 68,621
R&D Expenses [Member]      
Balance Sheet Components [Line Items]      
Total accrued expenses 28,347 20,755 21,607
Employee Related Expenses [Member]      
Balance Sheet Components [Line Items]      
Total accrued expenses 15,242 38,552 29,113
Professional Services Expenses [Member]      
Balance Sheet Components [Line Items]      
Total accrued expenses 16,489 10,267 5,135
Other General and Administrative Expenses [Member]      
Balance Sheet Components [Line Items]      
Total accrued expenses $ 13,710 $ 7,362 $ 12,766