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Investments - Summary of Investments by Type of Security (Detail) - USD ($) | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | $ 23,273,171 | $ 23,924,252
Gross Unrealized Gains | 257 | 3,466
Gross Unrealized Losses | (23,468) | (6,390)
Fair Market Value | 23,249,960 | 23,921,328
Corporate debt securities [Member] | Short-term [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 19,570,392 | 23,924,252
Gross Unrealized Gains |  | 3,466
Gross Unrealized Losses | (16,520) | (6,390)
Fair Market Value | 19,553,872 | $ 23,921,328
Corporate debt securities [Member] | Long-term [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 751,610 |
Gross Unrealized Losses | (3,860) |
Fair Market Value | 747,750 |
Government debt securities [Member] | Short-term [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 1,551,424 |
Gross Unrealized Gains | 257 |
Gross Unrealized Losses | (158) |
Fair Market Value | 1,551,523 |
Government debt securities [Member] | Long-term [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 1,399,745 |
Gross Unrealized Losses | (2,930) |
Fair Market Value | $ 1,396,815 |

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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=51813488&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=27724398&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=49167202&loc=d3e26610-111562 + Details
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