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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2012
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |
Total incomes taxes paid |  |  |  |  |  |  |  |  | $ 202,000 | $ 145,000
Unrecognized tax benefits | 300,000 |  |  |  | 300,000 |  |  |  | 300,000 | 300,000
Additional accruals of UTB's |  |  |  |  |  |  |  |  | 0 | 0
Additional accruals of interest expense nor penalties |  |  |  |  |  |  |  |  | 0 | 0
Tax refunds related to R&D Credits for tax years 2006 through 2008 |  |  |  |  |  |  |  |  | 827,000 |
Additional R&D Credits related to tax years 2009 through 2012 |  |  |  |  |  |  |  |  | 1,302,000 |
R&D Credits |  |  |  |  |  |  |  |  | 2,129,000 |
Income tax benefit | (1,163,000) | 873,000 | 733,000 | (835,000) | 137,000 | 513,000 | 1,405,000 | 325,000 | (392,000) | 2,380,000
Reduction in the company's current federal income taxes payable |  |  |  |  |  |  |  |  | 497,000 |
R&D Credits carry-forwards in the net deferred income | 805,000 |  |  |  |  |  |  |  | 805,000 |
Net deferred income and other tax liabilities | $ (484,000) |  |  |  | $ (974,000) |  |  |  | $ (484,000) | $ (974,000)
R&D Credits carry-forwards in the net deferred income expires minimum period |  |  |  |  |  |  |  |  | 2031 |
R&D Credits carry-forwards in the net deferred income expires maximum period |  |  |  |  |  |  |  |  | 2033 |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of tax realized upon settlement |  |  |  |  |  |  |  |  | 50.00% |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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