Fair Value Measurements - Assets Carried at Fair Value Measured on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014
Assets:
Cash equivalents	$ 10,800	$ 14,260
Cash equivalents and marketable securities	13,724	17,204
Corporate Bonds [Member]
Assets:
Marketable securities	2,674	2,444
Commercial Paper [Member]
Assets:
Marketable securities	250	500
Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Cash equivalents	10,800	14,260
Cash equivalents and marketable securities	12,972	16,196
Quoted Prices in Active Markets (Level 1) [Member] | Corporate Bonds [Member]
Assets:
Marketable securities	2,172	1,936
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash equivalents and marketable securities	752	1,008
Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]
Assets:
Marketable securities	502	508
Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member]
Assets:
Marketable securities	$ 250	$ 500