Income Taxes - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Tax Credit Carryforward [Line Items]
Current tax benefit or provision			$ 0	$ 0	$ 0
Income taxes paid			0	0	0
Deferred tax benefit or provision			0	$ 0	$ 0
Federal income tax rate	37.00%	39.60%		37.00%
Net operating loss carryovers			$ 140,600,000
Remaining capital loss carryovers expire			Mar. 31, 2020
Net operating loss carryovers begin to expire			Mar. 31, 2032
Deferred tax asset			$ 52,007,000	$ 52,150,000
Deferred tax assets, valuation allowance			58,701,000	54,740,000
Change in valuation allowance against net deferred tax assets			$ 4,000,000	$ (5,400,000)
Internal Revenue Service (IRS) [Member]
Tax Credit Carryforward [Line Items]
Statutory notification period			60 days