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 6 Months Ended
Mar. 01, 2018
USD ($)
ft²
Jun. 30, 2020
USD ($)
Jun. 30, 2020
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 $ 56,000 $ 223,000
Lessee, operating lease, existence of option to extend true    
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 and the Company is not reasonably certain that the option to renew the Lease will be exercised. Under the Lease, the Company furnished a security deposit in the form of a standby letter of credit in the amount of $0.3 million, which was reduced by fifty-five thousand dollars on the first anniversary of the commencement date.  The security deposit will continue to be reduced by fifty-five thousand dollars every two years on the commencement date anniversary for eight years.    
Security deposit in the form of a standby letter of credit $ 300,000    
Decrease in security deposit $ 55,000    
Maximum      
Commitment And Contingencies [Line Items]      
Milestone payments from the Company     $ 19,000,000.0