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Income Taxes: (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Current provision (benefit): |  |  |
Federal | $ 46,792 | $ 183,527 | $ (33,770)
State | (9,476) | (518) | (64,243)
Total current provision (benefit) | 37,316 | 183,009 | (98,013)
Deferred (benefit) provision: |  |  |
Federal | (2,435,049) |  |
State | 670 | 751 | (11,081)
Total deferred (benefit) provision | (2,434,379) | 751 | (11,081)
Total current and deferred (benefit) provision | $ (2,397,063) | $ 183,760 | $ (109,094)
Reconciliation of the statutory federal rate to the Company's effective income tax rate |  |  |
U.S. Federal statutory tax rate (as a percent) | 34.00% | 34.00% | 34.00%
State income taxes, net of federal benefit (as a percent) | 6.50% | (7.10%) | 13.80%
Permanent items (as a percent) | (1.80%) | (0.40%) | 1.30%
Research and development tax credits (as a percent) | (3.60%) | (27.50%) | (20.70%)
Valuation allowance (as a percent) | (433.50%) | 14.20% | (38.70%)
Change in unrecognized tax benefits (as a percent) | (13.50%) | 7.20% | (6.80%)
Effective income tax rate (as a percent) | (411.90%) | 20.40% | (17.10%)

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- Definition The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration