Income Taxes - Significant Components of Deferred Income Taxes (Detail) - USD ($)	Jun. 30, 2015	Jun. 30, 2014
Deferred tax assets:
Net operating loss carryforwards	$ 25,736,000	$ 30,123,000
Deferred revenue	2,194,000	2,194,000
Stock-based compensation	3,431,000	3,079,000
Tax credits	1,246,000	564,000
Provision for loss on note receivable	0	511,000
Other	110,000	88,000
Total deferred tax assets	32,717,000	36,559,000
Deferred tax liabilities:
Intangible assets	640,000	910,000
Deferred tax assets, net	32,077,000	35,649,000
Valuation allowance	32,077,000	35,649,000
Total deferred tax liability	$ 0	$ 0