Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.19.1
Commitments and Contingencies - Additional Information (Detail)
12 Months Ended
Mar. 01, 2018
USD ($)
ft²
Jul. 22, 2015
USD ($)
ft²
Dec. 31, 2018
USD ($)
Agreement
Dec. 31, 2017
USD ($)
Commitment And Contingencies [Line Items]        
Long-term lease agreement, area of office space | ft² 19,275      
Lease term 11 years      
Total lease payments $ 7,300,000      
Renewal term 5 years      
Renewal term, description The Company has the option to renew for two consecutive five-year periods from the end of the first term. Under the lease, the Company must furnish a security deposit in the form of a standby letter of credit in the amount of $0.3 million, which will be reduced by fifty-five thousand dollars every two years for ten years after the commencement of the lease      
Security deposit in the form of a standby letter of credit $ 300,000      
Decrease in security deposit $ 55,000      
Number of additional license agreements | Agreement     2  
License agreements fee     $ 2,300,000  
Maximum        
Commitment And Contingencies [Line Items]        
Milestone payments from the Company     19,000,000  
Jersey City, New Jersey        
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   $ 100,000    
Rent expense     $ 500,000 $ 300,000