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License Agreements - Additional Information (Detail)
1 Months Ended 12 Months Ended
Sep. 30, 2014
USD ($)
Dec. 31, 2018
USD ($)
License
University of Pennsylvania [Member]    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Annual maintenance fees $ 100,000  
University of Pennsylvania [Member] | Maximum [Member]    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Aggregate milestones payments 3,200,000  
Milestone payments based on annual sales milestones $ 5,000,000  
2010 License Agreement [Member]    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Annual maintenance fees   $ 100,000
Number of licensed products | License   2
Annual milestone payment made   $ 1,025,000
2010 License Agreement [Member] | Maximum [Member]    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Aggregate milestones payments   1,650,000
Milestone payments based on annual sales milestones   $ 2,500,000