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Investments - Summary of Investments by Type of Security (Detail) - USD ($) | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | $ 23,924,252 | $ 18,348,998
Gross Unrealized Gains | 3,466 | 1,472
Gross Unrealized Losses | (6,390) | (9,282)
Fair Market Value | 23,921,328 | 18,341,188
Corporate debt securities [Member] | Short-term [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 23,924,252 | 16,273,996
Gross Unrealized Gains | 3,466 | 1,472
Gross Unrealized Losses | (6,390) | (6,298)
Fair Market Value | $ 23,921,328 | 16,269,170
Corporate debt securities [Member] | Long-term [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost |  | 2,075,002
Gross Unrealized Losses |  | (2,984)
Fair Market Value |  | $ 2,072,018

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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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