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Income Taxes - Additional Information (Detail) (USD $) |  |  |  | 12 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Sep. 30, 2013 Federal | Sep. 30, 2013 New York | Sep. 30, 2013 Connecticut | Sep. 30, 2013 Pennsylvania | Sep. 30, 2013 New Jersey | Dec. 31, 2012 Minimum | Dec. 31, 2012 Maximum
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |
Net operating loss carryforward |  | $ 10,600,000 |  |  |  |  |  |  |  |
Annual limitation of federal NOLs |  |  |  |  |  |  |  |  | 1,000,000 | 2,200,000
Expiration date of net operating loss carryforward |  |  |  |  |  |  |  |  | Dec. 31, 2018 | Dec. 31, 2024
Unrecognized income tax benefit | 784,000 |  | 700,000 |  |  |  |  |  |  |
Unrecognized income tax benefit related accrued interest and penalties | $ 100,000 |  |  |  |  |  |  |  |  |
Number of years for examination |  |  |  | Four | Four | Four | Four | Five |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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