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, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Accrued compensation costs $ 968,169 $ 1,585,689
Accrued research and development service fees 583,176 2,076,764
Accrued insurance costs 459,381  
Accrued professional fees 416,229 433,498
Accrued facilities operation expenses 193,391 232,673
Other accrued liabilities 37,008 41,108
Total accrued liabilities $ 2,657,354 $ 4,369,732