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
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]    
Net loss applicable to common shareholders $ (3,022) $ (3,474)
Net loss per share-basic and diluted $ (0.24) $ (1.27)
Weighted average shares 12,431,488 2,734,196