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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
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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

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