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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Accrued Expenses    
Accrued research and development expenses $ 2,981,582 $ 3,423,220
Accrued license and milestone fees   2,000,000
Accrued consulting and other professional fees 433,199 242,227
Other accrued expenses 315,476 281,152
Accrued employee benefits 333,053 195,442
Accrued franchise and other taxes   3,590
Accrued expenses $ 4,063,310 $ 6,145,631