Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 111,577	$ 37,384
Gross Unrealized Gain	1	42
Gross Unrealized (Loss)	(70)	(2)
Fair Value	111,508	37,424
Certificate of Deposits
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,298	3,000
Gross Unrealized Gain		3
Fair Value	15,298	3,003
U.S. Treasury Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,086	5,059
Gross Unrealized Gain		6
Gross Unrealized (Loss)	(24)
Fair Value	35,062	5,065
U.S. Government Sponsored Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,357	14,311
Gross Unrealized Gain		31
Gross Unrealized (Loss)	(13)
Fair Value	18,344	14,342
Corporate Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	32,692	15,014
Gross Unrealized Gain		2
Gross Unrealized (Loss)	(33)	(2)
Fair Value	32,659	$ 15,014
Corporate Debt Securities | Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,144
Gross Unrealized Gain	1
Fair Value	$ 10,145