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 ($)
Sep. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued compensation costs $ 1,313,904 $ 2,107,118
Accrued research and development service fees 922,442 578,562
Accrued professional fees 483,686 168,168
Accrued facilities operation expenses 189,348 221,103
Other accrued liabilities 22,121 43,286
Total accrued liabilities $ 2,931,501 $ 3,118,237