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Investments - Summary of Investments by Type of Security (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Sep. 30, 2016
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | $ 26,961 | $ 26,810
Gross Unrealized Gains | 4 | 11
Gross Unrealized Losses | (18) | (6)
Fair Market Value | 26,947 | 26,815
U.S. Treasury, short-term |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost |  | 12,907
Gross Unrealized Gains |  | 8
Gross Unrealized Losses |  | 0
Fair Market Value |  | 12,915
U.S. Treasury, short-term | Short-term investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 10,002 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (5) |
Fair Market Value | 9,997 |
U.S. Treasury, short-term | Long-term investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 1,399 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (1) |
Fair Market Value | 1,398 |
Corporate debt securities | Short-term investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 13,062 | 11,949
Gross Unrealized Gains | 2 | 2
Gross Unrealized Losses | (10) | (3)
Fair Market Value | 13,054 | 11,948
Corporate debt securities | Long-term investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 2,498 | 1,954
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | (2) | (3)
Fair Market Value | $ 2,498 | $ 1,952

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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 Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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