Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail)
3 Months Ended 9 Months Ended
Mar. 01, 2018
USD ($)
ft²
Sep. 30, 2018
USD ($)
Agreement
Sep. 30, 2018
USD ($)
Agreement
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 2
License agreements fee   $ 2,300,000 $ 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]      
Rent expense   $ 200,000 $ 300,000