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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
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |
Revenue |  |  |  | $ 5,062
Net loss applicable to common shareholders | $ (9,730) | $ (4,197) | $ (10,100) | $ (15,034)
Net loss per share-basic and diluted | $ (1.35) | $ (0.14) | $ (4.15) | $ (0.50)
Weighted average shares | 7,225,826 | 30,013,928 | 2,435,095 | 29,925,479

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