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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Tax Credit Carryforward [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | $ 10,000,000.0 |  |  |
Adjustment of current income tax benefit | $ 3,200,000 |  |  |  |
Tax Cuts and Jobs Act, one-time transition tax |  |  | $ 0 |  |
NOL carry forwards |  |  | 47,976,000 |  |
Deferred tax asset, state NOLs |  |  | 1,779,000 |  |
Unrecognized Tax Benefits |  |  |  |  |
Remaining unrecognized tax benefits |  |  | 0 |  |
State and local |  |  |  |  |
Unrecognized Tax Benefits |  |  |  |  |
Interest and penalties |  |  | 9,000 | $ 6,000 | $ 40,000
NOL expiring between 2034 and 2036 |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
NOL carry forwards |  |  | 22,061,000 |  |
NOLs not expiring |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
NOL carry forwards |  |  | 25,915,000 |  |
Research tax credit carryforward | Federal |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Research tax credit |  |  | 27,828,000 |  |
Research tax credit carryforward | State and local |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Research tax credit |  |  | $ 13,743,000 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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