Overview of the Business and Basis of Presentation - Financial assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Common stock and common stock options
Assets, Fair value	$ 8,396	$ 4,489
Preferred Stock [Member]
Assets, Fair value	4,873	2,883
Available-for-sale Securities [Member]
Assets, Fair value	12,893	21,429
Cash and Cash Equivalents [Member]
Assets, Fair value	16,223	9,336
Equity investments
Assets, Fair value	13,269	7,372
Corporate Debt Securities [Member]
Assets, Fair value	12,893	21,429
Cash [Member]
Assets, Fair value	14,886	4,473
Money Market Funds [Member]
Assets, Fair value	1,337	4,863
Fair Value, Inputs, Level 1 [Member] | Common stock and common stock options
Assets, Fair value	8,396	4,489
Fair Value, Inputs, Level 1 [Member] | Preferred Stock [Member]
Assets, Fair value	2,187	0
Fair Value, Inputs, Level 1 [Member] | Available-for-sale Securities [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Assets, Fair value	16,223	9,336
Fair Value, Inputs, Level 1 [Member] | Equity investments
Assets, Fair value	10,583	4,489
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Cash [Member]
Assets, Fair value	14,886	4,473
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Assets, Fair value	1,337	4,863
Fair Value, Inputs, Level 2 [Member] | Common stock and common stock options
Assets, Fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Preferred Stock [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member]
Assets, Fair value	12,893	21,429
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Equity investments
Assets, Fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Assets, Fair value	12,893	21,429
Fair Value, Inputs, Level 2 [Member] | Cash [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Common stock and common stock options
Assets, Fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Preferred Stock [Member]
Assets, Fair value	2,686	2,883
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Equity investments
Assets, Fair value	2,686	2,883
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Cash [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Assets, Fair value	$ 0	$ 0