Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Assets, Fair Value Disclosure, Recurring	$ 42,763
Cash [Member]
Assets, Fair Value Disclosure, Recurring	5,646	$ 8,743
Money Market Funds [Member]
Assets, Fair Value Disclosure, Recurring	26,051	10,055
Commercial Paper [Member]
Assets, Fair Value Disclosure, Recurring	4,196
Cash and Cash Equivalents [Member]
Assets, Fair Value Disclosure, Recurring	35,893	18,798
Short-term Investments [Member]
Assets, Fair Value Disclosure, Recurring	6,870
Short-term Investments [Member] | Commercial Paper [Member]
Assets, Fair Value Disclosure, Recurring	6,870
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure, Recurring	31,697
Fair Value, Inputs, Level 1 [Member] | Cash [Member]
Assets, Fair Value Disclosure, Recurring	5,646	8,743
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Assets, Fair Value Disclosure, Recurring	26,051	10,055
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]
Assets, Fair Value Disclosure, Recurring	0
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Assets, Fair Value Disclosure, Recurring	31,697	18,798
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member]
Assets, Fair Value Disclosure, Recurring	0
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Commercial Paper [Member]
Assets, Fair Value Disclosure, Recurring	0
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	11,066
Fair Value, Inputs, Level 2 [Member] | Cash [Member]
Assets, Fair Value Disclosure, Recurring	0	0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Assets, Fair Value Disclosure, Recurring	0	0
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]
Assets, Fair Value Disclosure, Recurring	4,196
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Assets, Fair Value Disclosure, Recurring	4,196	0
Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member]
Assets, Fair Value Disclosure, Recurring	6,870
Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Commercial Paper [Member]
Assets, Fair Value Disclosure, Recurring	6,870
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure, Recurring	0
Fair Value, Inputs, Level 3 [Member] | Cash [Member]
Assets, Fair Value Disclosure, Recurring	0	0
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Assets, Fair Value Disclosure, Recurring	0	0
Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member]
Assets, Fair Value Disclosure, Recurring	0
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Assets, Fair Value Disclosure, Recurring	0	$ 0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member]
Assets, Fair Value Disclosure, Recurring	0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Commercial Paper [Member]
Assets, Fair Value Disclosure, Recurring	$ 0