Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Tax Credit Carryforward [Line Items]
Current tax benefit or provision	$ 0	$ 0
Income taxes paid	0	0
Deferred tax benefit or provision	0	$ 0
Net operating loss carryovers	$ 142,700,000
Remaining capital loss carryovers expire	Mar. 31, 2020
Net operating loss carryovers begin to expire	Mar. 31, 2032
Deferred tax asset	$ 52,787,000
Deferred tax assets, valuation allowance	56,982,000
Change in valuation allowance against net deferred tax assets	$ (1,700,000)
Internal Revenue Service (IRS) [Member]
Tax Credit Carryforward [Line Items]
Statutory notification period	60 days