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Fair Value Disclosure - Cash Equivalents and Long-term Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | ---
Auction rate security |  |
Asset at Fair Value |  |
Auction rate security | $ 1,571 | $ 1,571
Fair Value, Measurements, Recurring |  |
Asset at Fair Value |  |
Total assets measured at fair value | 4,044 | 4,018
Fair Value, Measurements, Recurring | Auction rate security |  |
Asset at Fair Value |  |
Auction rate security | 1,571 | 1,571
Fair Value, Measurements, Recurring | Level 1 |  |
Asset at Fair Value |  |
Total assets measured at fair value | 1,161 | 1,162
Fair Value, Measurements, Recurring | Level 1 | Auction rate security |  |
Asset at Fair Value |  |
Auction rate security | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |
Asset at Fair Value |  |
Total assets measured at fair value | 1,312 | 1,285
Fair Value, Measurements, Recurring | Level 2 | Auction rate security |  |
Asset at Fair Value |  |
Auction rate security | 0 | 0
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
Money Market Funds |  |
Asset at Fair Value |  |
Cash and cash equivalents | 400 | 400
Restricted cash and equivalents | 800 | 800
Money Market Funds | Fair Value, Measurements, Recurring |  |
Asset at Fair Value |  |
Cash and cash equivalents | 1,161 | 1,162
Money Market Funds | Fair Value, Measurements, Recurring | Level 1 |  |
Asset at Fair Value |  |
Cash and cash equivalents | 1,161 | 1,162
Money Market Funds | Fair Value, Measurements, Recurring | Level 2 |  |
Asset at Fair Value |  |
Cash and cash equivalents | 0 | 0
Money Market Funds | Fair Value, Measurements, Recurring | Level 3 |  |
Asset at Fair Value |  |
Cash and cash equivalents | 0 | 0
Certificates of Deposit |  |
Asset at Fair Value |  |
Cash and cash equivalents | 200 | 200
Restricted cash and equivalents | 1,100 | 1,100
Certificates of Deposit | Fair Value, Measurements, Recurring |  |
Asset at Fair Value |  |
Cash and cash equivalents | 1,312 | 1,285
Certificates of Deposit | Fair Value, Measurements, Recurring | Level 1 |  |
Asset at Fair Value |  |
Cash and cash equivalents | 0 | 0
Certificates of Deposit | Fair Value, Measurements, Recurring | Level 2 |  |
Asset at Fair Value |  |
Cash and cash equivalents | 1,312 | 1,285
Certificates of Deposit | Fair Value, Measurements, Recurring | Level 3 |  |
Asset at Fair Value |  |
Cash and cash equivalents | $ 0 | $ 0

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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