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Summary of Significant Accounting Policies - Summary of Accounts Payable and Other Accrued Expenses (Detail) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Trade payables $ 525,624 $ 426,727
Accrued compensation and benefits 470,974 1,027,757
Accrued directors fees 23,750  
Other 290,081 288,943
Total $ 1,310,429 $ 1,743,427