Fair Value Disclosure - Cash Equivalents and Long-term Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Jun. 30, 2022
Auction rate security
Asset at Fair Value
Auction rate security	$ 1,590	$ 1,590
Fair Value, Measurements, Recurring
Asset at Fair Value
Total assets measured at fair value	22,582	22,642
Fair Value, Measurements, Recurring \| Auction rate security
Asset at Fair Value
Auction rate security	1,590	1,590
Fair Value, Measurements, Recurring \| Level 1
Asset at Fair Value
Total assets measured at fair value	20,419	20,220
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	573	832
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	1,590	1,590
Fair Value, Measurements, Recurring \| Level 3 \| Auction rate security
Asset at Fair Value
Auction rate security	1,590	1,590
Money Market Funds
Asset at Fair Value
Cash and cash equivalents	20,300	20,000
Money Market Funds \| Fair Value, Measurements, Recurring
Asset at Fair Value
Cash and cash equivalents	20,419	20,220
Money Market Funds \| Fair Value, Measurements, Recurring \| Level 1
Asset at Fair Value
Cash and cash equivalents	20,419	20,220
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
Prepaid expense and other assets	100	300
Certificates of Deposit \| Fair Value, Measurements, Recurring
Asset at Fair Value
Cash and cash equivalents	573	832
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	573	832
Certificates of Deposit \| Fair Value, Measurements, Recurring \| Level 3
Asset at Fair Value
Cash and cash equivalents	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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)
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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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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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.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets.

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