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Fair Value Disclosure - Schedule of financial assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jun. 30, 2018
--- | --- | ---
Asset at Fair Value |  |
Restricted cash | $ 400 | $ 400
Auction rate security |  |
Asset at Fair Value |  |
Auction rate security |  | 1,571
Money market funds |  |
Asset at Fair Value |  |
Cash and cash equivalents | 300 | 300
Other assets |  |
Asset at Fair Value |  |
Restricted cash | 800 | 800
Certificates of deposit |  |
Asset at Fair Value |  |
Cash and cash equivalents | 29,700 | 29,200
Restricted cash | 1,100 | 1,000
Fair Value, Measurements, Recurring |  |
Asset at Fair Value |  |
Total assets measured at fair value | 33,508 | 32,926
Fair Value, Measurements, Recurring | Auction rate security |  |
Asset at Fair Value |  |
Auction rate security | 1,571 | 1,571
Fair Value, Measurements, Recurring | Money market funds |  |
Asset at Fair Value |  |
Cash and cash equivalents | 1,149 | 1,136
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Asset at Fair Value |  |
Cash and cash equivalents | 30,788 | 30,219
Fair Value, Measurements, Recurring | Level 1 |  |
Asset at Fair Value |  |
Total assets measured at fair value | 1,149 | 1,136
Fair Value, Measurements, Recurring | Level 1 | Auction rate security |  |
Asset at Fair Value |  |
Auction rate security | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |
Asset at Fair Value |  |
Cash and cash equivalents | 1,149 | 1,136
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit |  |
Asset at Fair Value |  |
Cash and cash equivalents | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |
Asset at Fair Value |  |
Total assets measured at fair value | 30,788 | 30,219
Fair Value, Measurements, Recurring | Level 2 | Auction rate security |  |
Asset at Fair Value |  |
Auction rate security | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Money market funds |  |
Asset at Fair Value |  |
Cash and cash equivalents | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit |  |
Asset at Fair Value |  |
Cash and cash equivalents | 30,788 | 30,219
Fair Value, Measurements, Recurring | Level 3 |  |
Asset at Fair Value |  |
Total assets measured at fair value | 1,571 | 1,571
Fair Value, Measurements, Recurring | Level 3 | Auction rate security |  |
Asset at Fair Value |  |
Auction rate security | 1,571 | 1,571
Fair Value, Measurements, Recurring | Level 3 | Money market funds |  |
Asset at Fair Value |  |
Cash and cash equivalents | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Certificates of deposit |  |
Asset at Fair Value |  |
Cash and cash equivalents | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585 + Details
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