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Statements of Convertible Preferred Stock and Shareholders' (Deficit) Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Convertible Preferred Stock
Common Stock
Additional Paid In Capital
Additional Paid In Capital
Revision of Prior Period, Accounting Standards Update, Adjustment
Accumulated Other Comprehensive (Loss) Gain
Accumulated Deficit
Accumulated Deficit
Revision of Prior Period, Accounting Standards Update, Adjustment
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance at Dec. 31, 2017 $ (224,616)     $ 1 $ 24,972 $ 140 $ (166) $ (249,423) $ (140)  
Beginning Balance, Shares at Dec. 31, 2017       12,208,731            
Convertible preferred stock, Beginning Balance at Dec. 31, 2017     $ 561,333              
Convertible preferred stock, Beginning Balance, Shares at Dec. 31, 2017     92,656,029              
Issuance of common stock for cash upon exercise of stock options 1,168       1,168          
Issuance of common stock for cash upon exercise of stock options, Shares       632,805            
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value     $ 100              
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value, Shares     134,065              
Vested Series E-1 convertible preferred stock option forfeitures 767       476     291    
Vested Series E-1 convertible preferred stock option forfeitures     $ (767)              
Series E-1 convertible preferred stock option share-based compensation 3       3          
Adjustment to redemption value for vested Series E-1 convertible preferred stock options (3)       (3)          
Adjustment to redemption value for vested Series E-1 convertible preferred stock options     3              
Change in redemption value for vested Series E-1 convertible preferred stock options (189)             (189)    
Change in redemption value for vested Series E-1 convertible preferred stock options     $ 189              
Common stock option share-based compensation 11,146       11,146          
Other comprehensive income (loss) 59           59      
Net loss (46,447)             (46,447)    
Ending Balance at Dec. 31, 2018 (258,112)     $ 1 37,902   (107) (295,908)    
Temporary Equity Ending Balance, Shares at Dec. 31, 2018     92,790,094              
Temporary Equity, Ending Balance at Dec. 31, 2018     $ 560,858              
Ending Balance, Shares at Dec. 31, 2018       12,841,536            
Proceeds from initial public offering/ issuance of common stock upon public offering, net of underwriters' discounts and commissions and net offering costs paid by us 320,850     $ 2 320,848          
Proceeds from initial public offering/ issuance of common stock upon public offering, net of underwriters' discounts and commissions and net offering costs paid by us, Shares       17,250,000            
Initial public offering costs (4,986)       (4,986)          
Conversion of convertible preferred stock to common stock 561,931   $ (561,931) $ 9 561,922          
Conversion of convertible preferred stock to common stock, Shares     (93,039,737) 93,039,737            
Conversion of convertible preferred stock warrant to common stock warrant 2,602       2,602          
Issuance of common stock upon exercise of common stock warrants 9       9          
Issuance of common stock upon exercise of common stock warrants, Shares       54,792            
Issuance of common stock for cash upon exercise of stock options 4,413       4,413          
Issuance of common stock for cash upon exercise of stock options, Shares       2,043,767            
Vesting of restricted stock units       8,310            
Common stock option and restricted stock unit share-based compensation 13,124       13,124          
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value     $ 109              
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value, Shares     249,643              
Change in redemption value for vested Series E-1 convertible preferred stock options (964)             (964)    
Change in redemption value for vested Series E-1 convertible preferred stock options     $ 964              
Other comprehensive income (loss) 778           778      
Net loss (68,606)             (68,606)    
Ending Balance at Dec. 31, 2019 $ 571,039     $ 12 935,834   671 (365,478)    
Ending Balance, Shares at Dec. 31, 2019       125,238,142            
Accounting Standards Update Extensible List us-gaap:AccountingStandardsUpdate201602Member                  
Proceeds from initial public offering/ issuance of common stock upon public offering, net of underwriters' discounts and commissions and net offering costs paid by us $ 271,839     $ 1 271,838          
Proceeds from initial public offering/ issuance of common stock upon public offering, net of underwriters' discounts and commissions and net offering costs paid by us, Shares       7,200,000            
Issuance of common stock for cash upon exercise of stock options $ 21,539     $ 1 21,538          
Issuance of common stock for cash upon exercise of stock options, Shares 5,204,254     5,204,254            
Vesting of restricted stock units       4,500            
Common stock option and restricted stock unit share-based compensation $ 24,761       24,761          
Other comprehensive income (loss) 222           222      
Net loss (146,227)             (146,227)    
Ending Balance at Dec. 31, 2020 $ 743,266 $ 93   $ 14 $ 1,253,971   $ 893 $ (511,612)   $ 93
Temporary Equity Ending Balance, Shares at Dec. 31, 2020     0              
Ending Balance, Shares at Dec. 31, 2020       137,646,896