Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 0	$ 0
Federal tax expense (benefit)	0	0
State tax expense (benefit)	0	$ 0
Deferred income tax valuation allowance	8,610,000
Net long-term deferred income tax asset or liability	0
Net operating loss carry-forward	$ 16,100,000
Net operating loss carryforward expiration year	2023 through fiscal 2038