Income Tax Provision - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Statutory tax rate	39.60%	39.60%	39.60%	39.60%
Current tax benefit or provision	$ 0	$ 0	$ 0	$ 0
Income taxes paid	0	0	0	0
Deferred tax benefit or provision	0	$ 0	0	$ 0
Capital losses carryovers	182,400,000		182,400,000
Net operating loss carryovers	92,900,000		$ 92,900,000
Capital loss carryovers begin to expire			Mar. 31, 2017
Net operating loss carryovers begin to expire			Mar. 31, 2032
Deferred tax asset	109,051,000		$ 109,051,000
Change in valuation allowance against net deferred tax assets	22,000,000		84,100,000
Deferred tax assets, valuation allowance	$ (120,021,000)		$ (120,021,000)