Quarterly report pursuant to Section 13 or 15(d)

License Agreements - Additional Information (Detail)

v3.21.2
License Agreements - Additional Information (Detail) - University of Bristol [Member] - USD ($)
 6 Months Ended
Jan. 22, 2018
Jun. 30, 2021
Jul. 31, 2016
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]      
Maximum amount payable under license agreement, tied to milestones     $ 3,200,000
Payments under license agreement   $ 125,000  
Amendment to the University of Bristol License Agreement [Member]      
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]      
Maximum amount payable under license agreement, tied to milestones $ 1,700,000    
Payments under license agreement $ 37,500