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 ($)
Jun. 30, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Accrued compensation costs $ 647,984 $ 1,585,689
Accrued professional fees 593,616 433,498
Accrued research and development service fees 512,405 2,076,764
Accrued facilities operation expenses 255,836 232,673
Other accrued liabilities 22,775 41,108
Total accrued liabilities $ 2,032,616 $ 4,369,732