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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]        
Net loss applicable to common shareholders $ (4,747) $ (3,163) $ (7,769) $ (6,637)
Net loss per share-basic and diluted $ (3.10) $ (11.50) $ (5.59) $ (24.08)
Weighted average shares 1,529,532 275,093 1,389,209 275,612