Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Income Tax Disclosure [Abstract]          
Provision for income taxes $ 0 $ 0 $ 0 $ 0  
Valuation allowance against deferred tax assets 13,500,000   13,500,000   9,500,000
Unrecognized tax positions $ 182,521   $ 182,521   $ 185,961