Accrued Expenses - Additional Information (Detail) - USD ($)	1 Months Ended
	Jan. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Schedule Of Accrued Expenses [Line Items]
Retention bonus agreements	$ 320,000
Personnel costs		$ 1,632,000	$ 1,314,000
Accrual of Cash Retention Bonus Component [Member]
Schedule Of Accrued Expenses [Line Items]
Personnel costs		$ 160,000