Annual report pursuant to Section 13 and 15(d)

Subsequent Event - Additional Information (Detail)

v3.20.4
Subsequent Event - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Feb. 28, 2021
Dec. 31, 2020
Dec. 31, 2019
Subsequent Event [Line Items]      
Net proceeds from common stock   $ 48,372 $ 53,449
Subsequent Event | Public Offering      
Subsequent Event [Line Items]      
Number of shares sold 6,000,000    
Shares issued, price per share $ 12.65    
Net proceeds from common stock $ 71,000    
Bristol Myers Squibb | Subsequent Event      
Subsequent Event [Line Items]      
Upfront payment 70,000    
Near term and development and regulatory milestones payment 874,500    
Milestone payments upon achievement of certain development and regulatory milestones $ 450,000