Stock-Based Compensation Expense and Issuance of Common Stock for Services Included in Consolidated Statements of Operations (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	$ 156,678	$ 480,681	$ 1,297,224
General and administrative
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	130,186	401,411	1,185,118
Research and development
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	$ 26,492	$ 79,270	$ 112,106