Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Detail)

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Income Taxes - Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Beginning balance $ 1,354,652 $ 1,241,781
Additions based on tax positions related to the current year 353,814 112,871
Additions for the tax positions of prior years 0 0
Reductions for the tax positions of prior years 0 0
Ending balance $ 1,708,466 $ 1,354,652