Annual report pursuant to Section 13 and 15(d)

Accrued Expenses - Summary of Accrued Expenses (Detail)

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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued compensation $ 1,097,997 $ 990,988
Accrued research and development 524,861  
Accrued legal expenses 253,730 524,685
Other accrued expenses 186,509 262,676
Total $ 2,063,097 $ 1,778,349