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Fair Value Disclosure - Cash Equivalents and Long-term Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Jun. 30, 2016
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Fair Value, Measurements, Recurring |  |
Asset at Fair Value |  |
Total | $ 2,955 | $ 2,958
Fair Value, Measurements, Recurring | Level 1 |  |
Asset at Fair Value |  |
Total | 312 | 315
Fair Value, Measurements, Recurring | Level 2 |  |
Asset at Fair Value |  |
Total | 0 | 0
Fair Value, Measurements, Recurring | Level 3 |  |
Asset at Fair Value |  |
Total | 2,643 | 2,643
Money market funds | Fair Value, Measurements, Recurring |  |
Asset at Fair Value |  |
Money market funds | 312 | 315
Money market funds | Fair Value, Measurements, Recurring | Level 1 |  |
Asset at Fair Value |  |
Money market funds | 312 | 315
Money market funds | Fair Value, Measurements, Recurring | Level 2 |  |
Asset at Fair Value |  |
Money market funds | 0 | 0
Money market funds | Fair Value, Measurements, Recurring | Level 3 |  |
Asset at Fair Value |  |
Money market funds | 0 | 0
Auction rate securities | Fair Value, Measurements, Recurring |  |
Asset at Fair Value |  |
Auction rate securities | 2,643 | 2,643
Auction rate securities | Fair Value, Measurements, Recurring | Level 1 |  |
Asset at Fair Value |  |
Auction rate securities | 0 | 0
Auction rate securities | Fair Value, Measurements, Recurring | Level 2 |  |
Asset at Fair Value |  |
Auction rate securities | 0 | 0
Auction rate securities | Fair Value, Measurements, Recurring | Level 3 |  |
Asset at Fair Value |  |
Auction rate securities | 2,643 | 2,643
Cash |  |
Asset at Fair Value |  |
Cash and cash equivalents | 146,153 | 180,426
Certificates of deposit |  |
Asset at Fair Value |  |
Certificates of deposit | $ 2,054 | $ 2,133

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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