Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Detail)

v3.7.0.1
Subsequent Events - Additional Information (Detail) - Subsequent Event - USD ($)
Mar. 16, 2017
Mar. 24, 2017
Longitude    
Subsequent Event [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  
Merger Agreement | Molecular Templates Inc    
Subsequent Event [Line Items]    
Molecular Templates equity holders ownership interest 65.60%  
Termination fee $ 800,000  
Merger Agreement | Minimum | Molecular Templates Inc    
Subsequent Event [Line Items]    
Amount of qualified financing contingent for repayment of promissory note 10,000,000  
Merger Agreement | Notes | Molecular Templates Inc    
Subsequent Event [Line Items]    
Aggregate principal amount $ 4,000,000  
Principal amount   $ 2,000,000