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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 |  |

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