Overview of Business and Basis of Presentation (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Equity investments [Member]
Assets, Fair Value Disclosure	$ 5,736	$ 6,629
Common stock [Member]
Assets, Fair Value Disclosure	4,686	5,537
Common stock warrants [Member]
Assets, Fair Value Disclosure	14	283
Available-for-sale investments [Member]
Assets, Fair Value Disclosure	12,539	13,381
Cash and cash equivalents [Member]
Assets, Fair Value Disclosure	20,938	32,992
Mutual funds [Member]
Assets, Fair Value Disclosure	1,036	809
Cash [Member]
Assets, Fair Value Disclosure	1,379	3,777
Money market funds [Member]
Assets, Fair Value Disclosure	19,559	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	12,539	10,087
Fair Value, Inputs, Level 1 [Member] | Equity investments [Member]
Assets, Fair Value Disclosure	5,736	6,629
Fair Value, Inputs, Level 1 [Member] | Common stock [Member]
Assets, Fair Value Disclosure	4,686	5,537
Fair Value, Inputs, Level 1 [Member] | Common stock warrants [Member]
Assets, Fair Value Disclosure	14	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	20,938	31,992
Fair Value, Inputs, Level 1 [Member] | Mutual funds [Member]
Assets, Fair Value Disclosure	1,036	809
Fair Value, Inputs, Level 1 [Member] | Cash [Member]
Assets, Fair Value Disclosure	1,379	3,777
Fair Value, Inputs, Level 1 [Member] | Money market funds [Member]
Assets, Fair Value Disclosure	19,559	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	0
Fair Value, Inputs, Level 2 [Member] | Available-for-sale investments [Member]
Assets, Fair Value Disclosure	12,539	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 funds [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	12,539	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 funds [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