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Income Taxes - Schedule of Income (Loss) Before Income Taxes (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Expected (benefit) $ (1,923,757) $ (3,718,058) $ (2,186,550)
Effects of:      
State income taxes net of federal benefits (92,707) (110,667) (65,082)
Nondeductible expense 29,670 711,679 (1,083,185)
Change in valuation allowance 3,765,560 28,258,724 4,189,828
Foreign Rate Differential (1,778,766) (1,097,681) (855,011)
Change in Deferred Taxes due to enacted changes in tax law   (24,043,997)  
Income tax provision (benefit) $ 0 $ 0 $ 0