XML 90 R61.htm IDEA: XBRL DOCUMENT v3.20.4
Shareholders' Equity (Deficit) - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jun. 23, 2020
May 26, 2020
Jun. 30, 2020
May 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Class Of Stock [Line Items]            
Preferred stock shares authorized         Unlimited  
Preferred stock shares issued         0 0
Preferred stock shares outstanding         0 0
Proceeds from issuance of warrant         $ 15,000  
Net proceeds from issuance of common shares in initial public offering         $ 232,043  
Common stock shares issued         36,902,924 1,528,374
2020 Employee Share Purchase Plan            
Class Of Stock [Line Items]            
Shares of common stock reserved for future issuance     696,029      
Annual increase in number of shares available for issuance as percentage of outstanding shares common stock on final day of preceding calendar year     1.00%      
Annual increase in number of shares available for issuance maximum number of common stock issued     3,300,000      
Purchase price of shares as percentage of fair market value of common stock on date of purchase     85.00%      
Common stock shares issued     0   0  
Maximum | 2020 Employee Share Purchase Plan            
Class Of Stock [Line Items]            
Shares of common stock reserved for future issuance     327,000      
Affiliate of Bristol Myers Squibb            
Class Of Stock [Line Items]            
Proceeds from issuance of warrant   $ 15,000   $ 15,000    
Affiliate of Bristol Myers Squibb | Initial Public Offering            
Class Of Stock [Line Items]            
Warrant exercise price per share $ 20.00          
Common Shares            
Class Of Stock [Line Items]            
Convertible preferred shares converted into common shares 21,558,393   21,558,393   21,558,393  
Shares issued upon exercise of warrants outstanding 750,000          
Shares issued, price per share $ 20.00          
Gross proceeds from IPO $ 253,000          
Net proceeds from issuance of common shares in initial public offering $ 232,043          
Common Shares | Initial Public Offering            
Class Of Stock [Line Items]            
Issuance of common shares upon initial public offering, net of issuance costs , Shares 12,650,000       12,650,000  
Common Shares | Exercise of Underwriters Option            
Class Of Stock [Line Items]            
Issuance of common shares upon initial public offering, net of issuance costs , Shares 1,650,000          
Common Shares | Exercise of Underwriters Option | Maximum            
Class Of Stock [Line Items]            
Issuance of common shares upon initial public offering, net of issuance costs , Shares 1,650,000          
Common Shares | Affiliate of Bristol Myers Squibb            
Class Of Stock [Line Items]            
Shares issued upon exercise of warrants outstanding 750,000