Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities - Summary of Accrued Liabilities (Detail)

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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued research and development service fees $ 991,861 $ 578,562
Accrued compensation costs 866,616 2,107,118
Accrued professional fees 269,915 168,168
Accrued facilities operation expenses 188,637 221,103
Other accrued liabilities 85,026 43,286
Total accrued liabilities $ 2,402,055 $ 3,118,237