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CONSOLIDATED STATEMENTS OF REDEEMABLE 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
Cumulative Effect, Period of Adoption, Adjustment
Additional Paid-in Capital
Initial Public Offering
Accumulated Other Comprehensive (Loss) Income
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Series A Redeemable Convertible Preferred Stock
Series B Redeemable Convertible Preferred Stock
Series C Redeemable Convertible Preferred Stock
Beginning balance at Dec. 31, 2018 $ (108,991)       $ 2 $ (17)   $ (9) $ (108,984) $ 17      
Temporary equity, Beginning balance, shares at Dec. 31, 2018                     33,200,000 20,479,162 20,204,079
Temporary equity, Beginning balance at Dec. 31, 2018                     $ 41,738 $ 75,900 $ 83,385
Beginning balance, shares at Dec. 31, 2018     2,921,268                    
Issuance of Series B redeemable convertible preferred stock in conjunction with sponsored research agreement                       $ 323  
Issuance of Series B redeemable convertible preferred stock in conjunction with sponsored research agreement, shares                       41,666  
Exercise of options to purchase common stock 259       259                
Exercise of options to purchase common stock, shares     75,772                    
Accretion of redeemable convertible preferred stock to redemption value (13,438)       (7,487)       (5,951)        
Temporary equity, Accretion of redeemable convertible preferred stock to redemption value                     $ 2,431 $ 4,885 $ 6,122
Stock-based compensation expense 7,245       7,245                
Unrealized gain on investments $ 52             52          
Accounting Standards Update Extensible List us-gaap:AccountingStandardsUpdate201807Member                        
Net loss $ (77,960)               (77,960)        
Ending balance at Dec. 31, 2019 $ (192,833)       2     43 (192,878)        
Temporary equity, Ending balance, shares at Dec. 31, 2019 73,924,907                   33,200,000 20,520,828 20,204,079
Temporary equity, Ending balance at Dec. 31, 2019 $ 214,784                   $ 44,169 $ 81,108 $ 89,507
Ending balance, shares at Dec. 31, 2019     2,997,040                    
Issuance of Series B redeemable convertible preferred stock in conjunction with sponsored research agreement, shares                       62,500  
Exercise of options to purchase common stock $ 232       232                
Exercise of options to purchase common stock, shares 47,592   47,592                    
Issuance of common stock, net of issuance costs $ 2,660 $ 74,352   $ 1 2,660   $ 74,351            
Issuance of common stock, net of issuance costs, shares     177,318 5,500,000                  
Accretion of redeemable convertible preferred stock to redemption value (10,784)       (7,237)       (3,547)        
Temporary equity, Accretion of redeemable convertible preferred stock to redemption value                     $ 2,097 $ 3,853 $ 4,834
Stock-based compensation expense 7,080       7,080                
Unrealized gain on investments (43)             $ (43)          
Conversion of redeemable convertible preferred stock into common stock upon initial public offering 225,568   $ 1   225,567                
Temporary Equity, Conversion of redeemable convertible preferred stock into common stock upon initial public offering, shares                     (33,200,000) (20,583,328) (20,204,079)
Temporary Equity, Conversion of redeemable convertible preferred stock into common stock upon initial public offering                     $ (46,266) $ (84,961) $ (94,341)
Conversion of redeemable convertible preferred stock into common stock upon initial public offering, shares     10,065,629                    
Net loss (91,665)               (91,665)        
Ending balance at Dec. 31, 2020 $ 14,567   $ 2   $ 302,655       $ (288,090)        
Temporary equity, Ending balance, shares at Dec. 31, 2020 0                   0 0 0
Ending balance, shares at Dec. 31, 2020     18,787,579