Stockholders' Equity - Additional Information (Detail) - USD ($)		1 Months Ended				12 Months Ended
	May 09, 2017	Jul. 31, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Class of Stock [Line Items]
Common stock issued to investors					4,440,000
Gross proceeds from issuance of common stock					$ 17,800,000
Common stock, shares authorized	60,000,000					120,000,000	60,000,000
Proposed new total of authorized shares, subject to stockholder approval	120,000,000
Common stock price per share					$ 4.00
Share issuance costs					$ 1,300,000
At-the-Market Offering [Member]
Class of Stock [Line Items]
Common stock shares maximum aggregate offering price				$ 20,000,000
Stock issuances, sales agent commission maximum percentage				3.00%
Legal, accounting and other costs						$ 223,000
Common stock issued to investors		15,587	5,100,000
Common stock price per share		$ 1.40	$ 1.74
Gross proceeds from issuance of common stock		$ 22,000	$ 8,900,000