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, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Accrued compensation $ 990,988 $ 948,935
Accrued legal expenses 524,685 445,684
Other accrued expenses 262,676 227,406
Total $ 1,778,349 $ 1,622,025