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License Agreements (Additional Information) (Detail) - USD ($)
Dec. 24, 2015
Dec. 16, 2015
Nov. 19, 2015
Sentynl Therapeutics, Inc. [Member]      
License And Collaboration Agreements [Line Items]      
Purchase Agreement, Consideration Receivable Under Agreement     $ 12,000,000
Purchase Agreement, Upfront Payment Receivable Under Agreement     8,000,000
Purchase Agreement, Contingent Consideration Receivable Under Agreement     4,000,000
Sentynl Therapeutics, Inc. [Member] | Minimum [Member]      
License And Collaboration Agreements [Line Items]      
Purchase Agreement, Contingent Consideration Threshold, Net Sales     25,000,000
Sentynl Therapeutics, Inc. [Member] | Maximum [Member]      
License And Collaboration Agreements [Line Items]      
Purchase Agreement, Contingent Consideration Threshold, Net Sales     $ 35,000,000
Monosol Rx, LLC [Member]      
License And Collaboration Agreements [Line Items]      
Purchase Agreement, Payment of Upfront Fee   $ 900,000  
Purchase Agreement, Payment of Upfront Fee, Percentage of Future Milestone Payments Received   20.00%  
Midatech Pharma PLC [Member]      
License And Collaboration Agreements [Line Items]      
Purchase Agreement, Consideration Receivable Under Agreement $ 29,750,000    
Purchase Agreement, Upfront Payment Receivable Under Agreement 3,750,000    
Purchase Agreement, Contingent Consideration Receivable Under Agreement 26,000,000    
Midatech Pharma PLC [Member] | Minimum [Member]      
License And Collaboration Agreements [Line Items]      
Purchase Agreement, Contingent Consideration Threshold, Net Sales 12,000,000    
Midatech Pharma PLC [Member] | Maximum [Member]      
License And Collaboration Agreements [Line Items]      
Purchase Agreement, Contingent Consideration Threshold, Net Sales $ 70,000,000