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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020
Income Tax Contingency [Line Items] |  |
Valuation allowance | $ 47,076,000 | $ 42,621,000
Impact on effective tax rate | 84,000,000.0 |
Accrued interest or penalties associated with uncertain tax positions | 0 | $ 0
United States [Member] |  |
Income Tax Contingency [Line Items] |  |
Operating loss carryforwards | $ 687,100,000 |
Operating loss carryforwards expiration beginning year | 2022 |
Tax years subject to examination | 2018 and thereafter |
United States [Member] | Research & Development [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforward amount | $ 214,200,000 |
United States [Member] | Research & Development [Member] | Earliest Tax Year [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforwards expiration beginning year | 2026 |
State [Member] |  |
Income Tax Contingency [Line Items] |  |
Operating loss carryforwards | $ 560,100,000 |
Operating loss carryforwards expiration beginning year | 2022 |
Tax years subject to examination | 2018 and thereafter |
State [Member] | Research & Development [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforward amount | $ 174,600,000 |
State [Member] | Research & Development [Member] | Earliest Tax Year [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforwards expiration beginning year | 2022 |
Foreign [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforward amount | $ 1,900,000 |
Tax years subject to examination | 2017 and thereafter |
Foreign [Member] | Earliest Tax Year [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforwards expiration beginning year | 2022 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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