Marketable Securities - Schedule of Amortized Cost, Unrealized Loss and Fair Value of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, Amortized Cost	$ 8,239	$ 13,681
Marketable securities, Unrealized Loss	(1)	(2)
Marketable securities, Fair Value	8,238	13,679
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, Amortized Cost	3,748	5,999
Marketable securities, Unrealized Loss	(1)	(2)
Marketable securities, Fair Value	3,747	5,997
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, Amortized Cost	4,491	7,682
Marketable securities, Unrealized Loss	0	0
Marketable securities, Fair Value	$ 4,491	$ 7,682