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Investments - Summary of Investments by Type of Security (Detail) (USD $) | Jun. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 6,519,143 | $ 7,905,843
Gross Unrealized Gains | 756 | 4,027
Gross Unrealized Losses | (4,317) | (4,643)
Fair Market Value | 6,515,582 | 7,905,227
Corporate debt securities [Member] | Short-term [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 6,519,143 | 5,818,549
Gross Unrealized Gains | 756 | 3,343
Gross Unrealized Losses | (4,317) | (2,355)
Fair Market Value | 6,515,582 | 5,819,537
Corporate debt securities [Member] | Long-term [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 2,087,294
Gross Unrealized Gains |  | 684
Gross Unrealized Losses |  | (2,288)
Fair Market Value |  | $ 2,085,690

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + 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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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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