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Licensing Arrangements - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
License Agreements [Line Items]    
Finite lived intangible asset, remaining amorization period   14 years
Accrued expenses $ 628,990 $ 76,957
DNMT1 Inhibitor License    
License Agreements [Line Items]    
Inhibitor License $ 110,474  
Finite lived intangible asset, remaining amorization period 20 years  
Accrued expenses $ 110,474  
LSD1 Inhibitor License    
License Agreements [Line Items]    
Inhibitor License $ 40,983 $ 40,983
Finite lived intangible asset, remaining amorization period 20 years