Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Revenue   $ 5,062
Net loss applicable to common shareholders $ (20,111) $ (21,363)
Net loss per share-basic and diluted $ (4.19) $ (7.79)
Weighted average shares 4,794,421 2,743,906