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, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Accrued compensation costs $ 742,592 $ 1,621,008
Accrued research and development service fees 725,846 3,865,146
Accrued professional fees 536,459 842,613
Accrued facilities operation expenses 191,449 180,158
Other accrued liabilities 40,839 63,387
Accrued insurance costs   231,477
Total accrued liabilities $ 2,237,185 $ 6,803,789