Annual report pursuant to Section 13 and 15(d)

Common Stock - Additional Information (Details)

v3.20.1
Common Stock - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Oct. 23, 2019
Oct. 31, 2019
May 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jan. 31, 2019
Class Of Stock [Line Items]            
Common stock, authorized shares       150,000,000 21,147,115 29,000,000
Common stock, issued shares       24,034,022 3,848,320  
Common stock, outstanding shares       24,034,022 3,848,320  
Common stock shares modified     2,904,000      
Fair value of common stock shares modified     $ 0.74      
Total compensation cost of common stock shares modified     $ 2,126      
Unrecognized compensation cost, period for recognition       2 years 2 months 12 days    
Compensation cost recognized       $ 2,300 $ 606  
Common stock, dividends declared       $ 0    
Convertible preferred stock convert into non-voting common stock   6,409,519        
Unrecognized compensation cost related to unvested stock-based awards       $ 6,797    
2019 Plan            
Class Of Stock [Line Items]            
Shares reserved for issuance 2,342,288          
Increase in share reserved percentage 4.00%          
2019 ESPP            
Class Of Stock [Line Items]            
Shares reserved for issuance 234,229          
Minimum | 2019 ESPP            
Class Of Stock [Line Items]            
Shares reserved for issuance 234,229          
Increase in share reserved percentage 1.00%          
Stock Options | 2018 Plan            
Class Of Stock [Line Items]            
Number of options granted       1,959,411    
Stock Options | 2018 and 2019 Plan            
Class Of Stock [Line Items]            
Number of options granted       1,340,839 971,353  
Weighted average grant-date fair value of stock options granted       $ 5.24 $ 1.91  
Aggregate grant-date fair value of options vested       $ 753 $ 26  
Stock Options | Minimum | 2018 Plan            
Class Of Stock [Line Items]            
Percentage of exercise price per share of fair market value       100.00%    
Share-based compensation, vesting period       3 years    
Stock Options | Maximum | 2018 Plan            
Class Of Stock [Line Items]            
Term of stock options after grant date       10 years    
Share-based compensation, vesting period       4 years    
Performance-Based Shares            
Class Of Stock [Line Items]            
Unrecognized compensation cost related to unvested stock-based awards, other than options       $ 176    
Research and Development            
Class Of Stock [Line Items]            
Compensation cost recognized       1,304 455  
General and Administrative Expense            
Class Of Stock [Line Items]            
Compensation cost recognized       $ 996 151  
Founders            
Class Of Stock [Line Items]            
Unrecognized compensation cost, period for recognition     3 years 1 year 3 months 18 days    
Unrecognized compensation cost related to unvested stock-based awards       $ 912    
Founders | Research and Development            
Class Of Stock [Line Items]            
Compensation cost recognized       529 399  
Founders | General and Administrative Expense            
Class Of Stock [Line Items]            
Compensation cost recognized       $ 177 $ 118  
Voting Common Stock            
Class Of Stock [Line Items]            
Common stock, authorized shares   143,590,481   143,590,481 21,147,115  
Common stock, issued shares       17,624,503 3,848,320  
Common stock, outstanding shares       17,624,503 3,848,320  
Non-voting Common Stock            
Class Of Stock [Line Items]            
Common stock, authorized shares   6,409,519   6,409,519    
Common stock, issued shares       6,409,519    
Common stock, outstanding shares       6,409,519