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Short-term Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Schedule Of Available For Sale Securities [Line Items] |  |
Short-term Investments, Amortized Cost | $ 25,553 | $ 36,195
Short-term Investments, Unrealized Losses | (82) | (58)
Short-term Investments, Estimated Fair Value | 25,471 | 36,137
Corporate bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Short-term Investments, Amortized Cost | 17,851 | 22,832
Short-term Investments, Unrealized Losses | (60) | (34)
Short-term Investments, Estimated Fair Value | 17,791 | 22,798
Government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Short-term Investments, Amortized Cost | 7,702 | 13,363
Short-term Investments, Unrealized Losses | (22) | (24)
Short-term Investments, Estimated Fair Value | $ 7,680 | $ 13,339

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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