Overview of Business and Basis of Presentation (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 |
Equity investments [Member] | | |
Assets, Fair Value Disclosure | $ 5,143 | $ 6,629 |
Common Stock [Member] | | |
Assets, Fair Value Disclosure | 4,218 | 5,537 |
Common stock warrants [Member] | | |
Assets, Fair Value Disclosure | 101 | 283 |
Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | 9,657 | 13,381 |
Cash and Cash Equivalents [Member] | | |
Assets, Fair Value Disclosure | 34,858 | 32,992 |
Mutual Fund [Member] | | |
Assets, Fair Value Disclosure | 824 | 809 |
Cash [Member] | | |
Assets, Fair Value Disclosure | 4,194 | 3,777 |
Money Market Funds [Member] | | |
Assets, Fair Value Disclosure | 30,664 | 28,215 |
Commercial Paper [Member] | | |
Assets, Fair Value Disclosure | | 1,000 |
Commercial Paper [Member] | Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | | 3,294 |
Corporate debt [Member] | Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | 9,657 | 10,087 |
Fair Value, Inputs, Level 1 [Member] | Equity investments [Member] | | |
Assets, Fair Value Disclosure | 5,143 | 6,629 |
Fair Value, Inputs, Level 1 [Member] | Common Stock [Member] | | |
Assets, Fair Value Disclosure | 4,218 | 5,537 |
Fair Value, Inputs, Level 1 [Member] | Common stock warrants [Member] | | |
Assets, Fair Value Disclosure | 101 | 283 |
Fair Value, Inputs, Level 1 [Member] | Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | | |
Assets, Fair Value Disclosure | 34,858 | 31,992 |
Fair Value, Inputs, Level 1 [Member] | Mutual Fund [Member] | | |
Assets, Fair Value Disclosure | 824 | 809 |
Fair Value, Inputs, Level 1 [Member] | Cash [Member] | | |
Assets, Fair Value Disclosure | 4,194 | 3,777 |
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] | | |
Assets, Fair Value Disclosure | 30,664 | 28,215 |
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member] | | |
Assets, Fair Value Disclosure | | 0 |
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member] | Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | | 0 |
Fair Value, Inputs, Level 1 [Member] | Corporate debt [Member] | Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Equity investments [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Common Stock [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Common stock warrants [Member] | | |
Assets, Fair Value Disclosure | | 0 |
Fair Value, Inputs, Level 2 [Member] | Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | 9,657 | 13,381 |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] | | |
Assets, Fair Value Disclosure | 0 | 1,000 |
Fair Value, Inputs, Level 2 [Member] | Mutual Fund [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Cash [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member] | | |
Assets, Fair Value Disclosure | | 1,000 |
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member] | Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | | 3,294 |
Fair Value, Inputs, Level 2 [Member] | Corporate debt [Member] | Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | 9,657 | 10,087 |
Fair Value, Inputs, Level 3 [Member] | Equity investments [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Common Stock [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Common stock warrants [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Mutual Fund [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Cash [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member] | | |
Assets, Fair Value Disclosure | | 0 |
Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member] | Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | | 0 |
Fair Value, Inputs, Level 3 [Member] | Corporate debt [Member] | Available-for-sale investments [Member] | | |
Assets, Fair Value Disclosure | $ 0 | $ 0 |