Quarterly report pursuant to Section 13 or 15(d)

License and Collaboration Agreements - Additional Information (Detail)

v3.20.2
License and Collaboration Agreements - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Sep. 30, 2020
Dec. 31, 2019
License Collaboration And Manufacturing Agreements [Line Items]      
Contractual obligations due to MSK and QIMR   $ 0 $ 0
MSK Agreements      
License Collaboration And Manufacturing Agreements [Line Items]      
Potential milestone payments payable   $ 33,000,000.0  
Payments for research and development $ 12,500,000