Overview of the Business and Basis of Presentation - Financial assets and liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jun. 30, 2019
Liabilities, Fair value	$ 2,010	$ 3,090
Available-for-sale Securities [Member]
Assets, Fair value	10,952	20,393
Cash and Cash Equivalents [Member]
Assets, Fair value	16,763	8,083
Equity Securities [Member]
Assets, Fair value	7,374	7,405
Equity Securities [Member] | Common stock warrants
Assets, Fair value		1
Equity Securities [Member] | Common Stock [Member]
Assets, Fair value	4,491	4,521
Equity Securities [Member] | Preferred Stock [Member]
Assets, Fair value	2,883	2,883
Corporate Debt Securities [Member]
Assets, Fair value	10,952	20,393
Cash [Member] | Cash and Cash Equivalents [Member]
Assets, Fair value	13,574	5,223
Money Market Funds [Member] | Cash and Cash Equivalents [Member]
Assets, Fair value	3,189	2,860
Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair value	0	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	16,763	8,083
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Assets, Fair value	4,491	4,522
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Common stock warrants
Assets, Fair value		1
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Common Stock [Member]
Assets, Fair value	4,491	4,521
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Preferred Stock [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Cash [Member] | Cash and Cash Equivalents [Member]
Assets, Fair value	13,574	5,223
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] | Cash and Cash Equivalents [Member]
Assets, Fair value	3,189	2,860
Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member]
Assets, Fair value	10,952	20,393
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Common stock warrants
Assets, Fair value		0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Common Stock [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Preferred Stock [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Assets, Fair value	10,952	20,393
Fair Value, Inputs, Level 2 [Member] | Cash [Member] | Cash and Cash Equivalents [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] | Cash and Cash Equivalents [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair value	2,010	3,090
Fair Value, Inputs, Level 3 [Member] | Preferred Stock [Member]
Assets, Fair value	2,883	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 Securities [Member]
Assets, Fair value	2,883	2,883
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Common stock warrants
Assets, Fair value		0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Common Stock [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Preferred Stock [Member]
Assets, Fair value	2,883	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] | Cash and Cash Equivalents [Member]
Assets, Fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] | Cash and Cash Equivalents [Member]
Assets, Fair value	0	0
Contingent Consideration [Member]
Liabilities, Fair value	1,960	2,890
Contingent Consideration [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair value	0	0
Contingent Consideration [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair value	0	0
Contingent Consideration [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair value	1,960	2,890
Common stock warrants
Liabilities, Fair value	50	200
Common stock warrants | Fair Value, Inputs, Level 1 [Member]
Liabilities, Fair value	0	0
Common stock warrants | Fair Value, Inputs, Level 2 [Member]
Liabilities, Fair value	0	0
Common stock warrants | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair value	$ 50	$ 200