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Commitments and Contingencies - Additional Information (Detail)
3 Months Ended 9 Months Ended
Jul. 22, 2015
USD ($)
ft²
Sep. 30, 2016
USD ($)
Agreement
Sep. 30, 2016
USD ($)
Agreement
Commitment And Contingencies [Line Items]      
Number of additional license agreements | Agreement   2 2
License agreements fee   $ 2,300,000 $ 2,300,000
Maximum [Member]      
Commitment And Contingencies [Line Items]      
Milestone payments from the Company     19,000,000
Jersey City, New Jersey [Member]      
Commitment And Contingencies [Line Items]      
Area of subleased space (in sqft) | ft² 10,141    
Base rent, per month $ 25,000    
Annual increase in base rent (percent) 3.00%    
Security deposit paid $ 74,000    
Rent expense   $ 74,000 $ 221,000