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Stockholders' equity - Additional Information (Detail) - USD ($)
 12 Months Ended
Oct. 24, 2018
Dec. 31, 2018
Dec. 31, 2017
Changes In Equity And Comprehensive Income Line Items [Line Items]      
Preferred stock, shares authorized (shares)   10,000,000 10,000,000
Preferred stock, shares issued (shares)   0 0
Private offering and cash proceeds   $ 2,025,269  
Common Stock Shares Issued   2,072,708 1,265,206
Accrued Investment   $ 2,900,000  
Term of preferred units issuance   3 years  
Preferred Units Agreed To Be Sold Value   $ 3,000,000  
Common stock, share issued, value   $ 2,033 $ 1,179
Common shares not approved for issuance   12,907  
Accrued liability   $ 110,474  
Profit Interest Common Unit, Outstanding   6,945 6,643
Profit Interest Common Unit, Issued   917 332
Profit Interest Members' Equity   $ 0 $ 0
Salarius      
Changes In Equity And Comprehensive Income Line Items [Line Items]      
Common Stock Shares Issued   0 1,702
Common stock, share issued, value   $ 0 $ 12,000
Series A Preferred Stock      
Changes In Equity And Comprehensive Income Line Items [Line Items]      
Preferred stock, shares authorized (shares)   10,000  
Preferred stock, shares issued (shares)   1,861  
Private offering and cash proceeds   $ 1,900,000  
Common Stock Shares Issued 1,225    
Shares issued upon conversion 1,530    
Converted stock units value $ 1,400,000