Quarterly report pursuant to Section 13 or 15(d)

Reverse Merger - Summary of Pro Forma Results of Operation (Detail)

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Reverse Merger - Summary of Pro Forma Results of Operation (Detail) - OncoGenex Pharmaceuticals, Inc [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]        
Net loss applicable to common shareholders $ (3,240) $ (9,730) $ (9,050) $ (10,100)
Net loss per share-basic and diluted $ (0.71) $ (13.47) $ (3.70) $ (41.48)
Weighted average shares 4,533,943 722,583 2,448,962 243,510