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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Income Tax Disclosure [Abstract]          
Provision for income taxes $ 0 $ 0 $ 0 $ 0  
Valuation allowance against deferred tax assets 12,000,000   12,000,000   9,500,000
Unrecognized tax positions $ 192,889   $ 192,889   $ 185,961