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Commitments and Contingencies - Summary of Components of Rent Expense (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Leases [Abstract]      
Rent expense $ 1,844,610 $ 1,955,747 $ 2,612,899
Sublease income     (53,726)
Rent expense, net $ 1,844,610 $ 1,955,747 $ 2,559,173