Fair Value Measurements (Schedule of Fair Value for Financial Assets Measured on Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Assets
Total assets measured at fair value	$ 5,550	$ 7,291
Money market funds
Assets
Investments	4,500	4,291
Marketable securities
Assets
Investments	1,050
Investment in non-marketable equity
Assets
Investments		3,000
Level 1
Assets
Total assets measured at fair value	5,550	4,291
Level 1 | Money market funds
Assets
Investments	4,500	4,291
Level 1 | Marketable securities
Assets
Investments	$ 1,050
Level 3
Assets
Total assets measured at fair value		3,000
Level 3 | Investment in non-marketable equity
Assets
Investments		$ 3,000