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 Millions
 12 Months Ended
Aug. 01, 2017
Right
$ / shares
shares
Jan. 05, 2017
Dec. 31, 2017
USD ($)
shares
Mar. 31, 2018
shares
Business Acquisition [Line Items]        
Common stock, shares outstanding | shares     11,947,932 12,747,932
Contingent value rights recovery | $     $ 0.2  
OncoGenex Pharmaceuticals, Inc [Member]        
Business Acquisition [Line Items]        
Reverse stock split ratio 0.0909 0.0909    
Share price $ 4.62      
Common stock, shares outstanding | shares 2,736,703      
Number of non-transferable contingent value rights with potential cash and other consideration receivable right | Right 1      
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 26 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 21 days