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

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

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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).

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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 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.

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