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Balance Sheet Components - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020
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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

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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