Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 24,085	$ 37,384
Gross Unrealized Gain		42
Gross Unrealized (Loss)	(14)	(2)
Fair Value	24,071	37,424
Certificate of Deposits
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,239	3,000
Gross Unrealized Gain		3
Fair Value	4,239	3,003
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,773
Fair Value	3,773
U.S. Treasury Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,034	5,059
Gross Unrealized Gain		6
Gross Unrealized (Loss)	(3)
Fair Value	5,031	5,065
U.S. Government Sponsored Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,217	14,311
Gross Unrealized Gain		31
Gross Unrealized (Loss)	(3)
Fair Value	3,214	14,342
Corporate Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,822	15,014
Gross Unrealized Gain		2
Gross Unrealized (Loss)	(8)	(2)
Fair Value	$ 7,814	$ 15,014