Quarterly report pursuant to Section 13 or 15(d)

Reverse Merger - Additional Information (Detail)

v3.8.0.1
Reverse Merger - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 9 Months Ended
Aug. 17, 2017
USD ($)
Aug. 01, 2017
Right
$ / shares
shares
Sep. 30, 2017
USD ($)
shares
Dec. 31, 2016
shares
Business Acquisition [Line Items]        
Common stock, shares outstanding | shares     11,482,845 21,230
Contingent value rights recovery | $     $ 200  
OncoGenex Pharmaceuticals, Inc [Member]        
Business Acquisition [Line Items]        
Reverse stock split ratio   0.0909    
Share price   $ 4.62    
Common stock, shares outstanding | shares   2,736,703    
Number of contingent value rights to be issued for each share of common stock outstanding | Right   1    
Contingent value rights recovery | $ $ 200      
OncoGenex Pharmaceuticals, Inc [Member] | Contingent Value Rights [Member]        
Business Acquisition [Line Items]        
Combined company acquisition period results   5 years    
Aggregate consideration distributed to the holders, consideration received percent   80.00%    
OncoGenex Pharmaceuticals, Inc [Member] | Warrant [Member]        
Business Acquisition [Line Items]        
Share price   $ 4.62    
OncoGenex Pharmaceuticals, Inc [Member] | Warrant [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Volatility rate   90.33%    
Risk-free interest rate   1.32%    
Expected lives   1 year 10 months 28 days    
OncoGenex Pharmaceuticals, Inc [Member] | Warrant [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Volatility rate   106.08%    
Risk-free interest rate   1.53%    
Expected lives   3 years 2 months 27 days    
OncoGenex Pharmaceuticals, Inc [Member] | Stock Options [Member]        
Business Acquisition [Line Items]        
Share price   $ 4.62    
OncoGenex Pharmaceuticals, Inc [Member] | Stock Options [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Volatility rate   97.23%    
Risk-free interest rate   1.31%    
Expected lives   1 year 9 months 25 days    
OncoGenex Pharmaceuticals, Inc [Member] | Stock Options [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Volatility rate   106.63%    
Risk-free interest rate   1.54%    
Expected lives   3 years 3 months 22 days