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Commitments and Contingencies - University of California License Agreements - Additional Information (Detail) - University of California License Agreements [Member]
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
May 31, 2014
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Milestone
Jun. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Commitments And Contingencies [Line Items]              
Research and development expense related to milestone expense   $ 0       $ 0  
Milestone payments   $ 0       $ 0  
Upfront payment         $ 50,000    
Annual license maintenance fee             $ 15,000
After The Effective Date [Member]              
Commitments And Contingencies [Line Items]              
Licenses Expiration period, maximum 27 years            
After The First Sale [Member]              
Commitments And Contingencies [Line Items]              
Licenses Expiration period, maximum 15 years            
Clinical Development [Member]              
Commitments And Contingencies [Line Items]              
Milestones achieved | Milestone       1      
Research and development expense related to milestone expense     $ 25,000 $ 100,000      
Milestone payments       $ 100,000      
Clinical Development [Member] | Maximum [Member]              
Commitments And Contingencies [Line Items]              
Milestone payments $ 100,000            
Percentage of net sales paid as royalties 1.00%            
Regulatory Milestones [Member] | Maximum [Member]              
Commitments And Contingencies [Line Items]              
Expected milestone payments     700,000   700,000    
Sales Milestones [Member] | Maximum [Member]              
Commitments And Contingencies [Line Items]              
Expected milestone payments     $ 2,000,000   $ 2,000,000