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Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Initial Public Offering
Common Stock
Common Stock
Initial Public Offering
Additional Paid-In Capital
Additional Paid-In Capital
Initial Public Offering
Accumulated Deficit
Accumulated Other Comprehensive Income (loss)
Convertible Preferred Stock
Convertible Preferred Stock
Initial Public Offering
Beginning Balance at Dec. 31, 2018 $ (66,792)       $ 2,007   $ (68,799)      
Temporary Equity, Beginning Balance, Shares at Dec. 31, 2018                 80,377,096  
Temporary Equity, Beginning Balance at Dec. 31, 2018                 $ 78,811  
Beginning Balance, Shares at Dec. 31, 2018     1,292,858              
Issuance of convertible preferred stock, net of issuance costs and discount on allocation of proceeds to preferred stock tranche obligation                 $ 52,552  
Issuance of convertible preferred stock, net of issuance costs and discount on allocation of proceeds to preferred stock tranche obligation, Shares                 37,432,787  
Stock issued on exercise of stock options 134       134          
Stock issued on exercise of stock options, Shares     78,609              
Stock-based compensation expense 738       738          
Net loss (37,037)           (37,037)      
Unrealized (loss) gain on available-for-sale securities, net of tax 3             $ 3    
Ending Balance at Dec. 31, 2019 $ (102,954)       2,879   (105,836) 3    
Temporary Equity, Ending Balance, Shares at Dec. 31, 2019 117,809,883               117,809,883  
Temporary Equity, Ending Balance at Dec. 31, 2019 $ 131,363               $ 131,363  
Ending Balance, Shares at Dec. 31, 2019     1,371,467              
Issuance of common stock upon the initial public offering, net   $ 92,050   $ 1   $ 92,049        
Issuance of common stock upon initial public offering, net of issuance costs, Shares       6,468,750            
Conversion of convertible preferred stock into common stock upon the initial public offering   $ 131,363   $ 1   $ 131,362        
Temporary Equity, Conversion of convertible preferred stock into common stock upon initial public offering, Shares                   (117,809,883)
Temporary Equity, Conversion of convertible preferred stock into common stock upon initial public offering                   $ (131,363)
Conversion of convertible preferred stock into common stock upon the initial public offering, Shares       13,085,913            
Stock issued on exercise of stock options $ 77       77          
Stock issued on exercise of stock options, Shares 53,134   53,135              
Stock-based compensation expense $ 1,788       1,788          
Net loss (27,531)           (27,531)      
Unrealized (loss) gain on available-for-sale securities, net of tax (7)             (7)    
Ending Balance at Dec. 31, 2020 $ 94,786   $ 2   $ 228,155   $ (133,367) $ (4)    
Ending Balance, Shares at Dec. 31, 2020     20,979,265