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Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
External services $ 1,949,398 $ 2,152,770
Employee compensation 2,758,798 2,415,826
Other 1,023,400 301,114
Total accrued expenses and other current liabilities $ 5,731,596 $ 4,869,710