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Fair Value Measurements - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant exercise price	$ 1.23	$ 1.23		$ 2.50	$ 2.50
Transaction costs allocated to second tranche liability and additional advance warrant liability	$ 326,000
Second Tranche Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant exercise price			$ 1.43