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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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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Amount of income tax expense from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.

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Amount of expense 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.

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