Quarterly report pursuant to Section 13 or 15(d)

Merger Agreement with Molecular Templates - Additional Information (Detail)

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Merger Agreement with Molecular Templates - Additional Information (Detail) - USD ($)
Jun. 23, 2017
Mar. 16, 2017
Jun. 01, 2017
Mar. 24, 2017
Longitude Ventures and Other Investors        
Business Acquisition [Line Items]        
Commitment to purchase equity securities under equity commitment letter   $ 20,000,000    
Amount of additional equity commitments to be secured for equity commitment letter   20,000,000    
Expected aggregate amount of concurrent financing   $ 40,000,000    
Merger Agreement | Molecular Templates Inc        
Business Acquisition [Line Items]        
Molecular Templates equity holders ownership interest   65.60%    
Termination fee   $ 800,000    
Merger Agreement | Molecular Templates Inc | Minimum        
Business Acquisition [Line Items]        
Amount of qualified financing contingent for repayment of promissory note   10,000,000    
Merger Agreement | Molecular Templates Inc | Notes        
Business Acquisition [Line Items]        
Aggregate principal amount   $ 4,000,000    
Principal amount     $ 2,000,000 $ 2,000,000
Merger Agreement | Molecular Templates Inc and Millennium Pharmaceuticals Inc        
Business Acquisition [Line Items]        
Expected contingent proceeds from stock purchase agreement with Millennium Pharmaceuticals, Inc. $ 20,000,000      
Per share price (pre-reverse split) at which stock will sold to Millennium Pharmaceuticals, Inc. $ 0.61      
Merger Agreement | Molecular Templates Inc and Millennium Pharmaceuticals Inc | Minimum        
Business Acquisition [Line Items]        
Millennium Pharmaceuticals, post closing beneficial ownership percentage limitation 19.00%