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CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
IPO
Follow-On Public Offering
Redeemable Convertible Preferred Stock
Common Stock
Common Stock
Restricted Stock Units
Common Stock
IPO
Common Stock
Follow-On Public Offering
Additional Paid-in Capital
Additional Paid-in Capital
IPO
Additional Paid-in Capital
Follow-On Public Offering
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Temporary Equity, Balance at Dec. 31, 2017         $ 360,165                  
Temporary Equity, Balance, shares at Dec. 31, 2017         50,545,260                  
Balance at Dec. 31, 2017 $ (201,499) $ 1,658       $ 8             $ (201,507) $ 1,658
Balance (in shares) at Dec. 31, 2017           8,522,110                
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201409Member                          
Stock-based compensation $ 1,158                 $ 1,158        
Exercise of stock options 31                 31        
Exercise of stock options (in shares)           12,502                
Vesting of restricted stock awards/units (in shares)           36,774                
Issuance of Series G redeemable convertible preferred stock, net of issuance costs         $ 145,899                  
Issuance of Series G redeemable convertible preferred stock, net of issuance costs, shares         16,280,040                  
Accretion of redeemable convertible preferred stock (13,036)                 (1,189)     (11,847)  
Temporary equity, Accretion of redeemable convertible preferred stock         $ 13,036                  
Net loss (85,178)                       (85,178)  
Temporary Equity, Balance at Dec. 31, 2018         $ 519,100                  
Temporary Equity, Balance, shares at Dec. 31, 2018         66,825,300                  
Balance at Dec. 31, 2018 (296,866)         $ 8             (296,874)  
Balance (in shares) at Dec. 31, 2018           8,571,386                
Stock-based compensation 2,756                 2,756        
Exercise of stock options 466                 466        
Exercise of stock options (in shares)           135,950                
Vesting of restricted stock awards/units 1,344                 1,344        
Vesting of restricted stock awards/units (in shares)           623,832                
Repurchase of common stock (5,824)                 (4,566)     (1,258)  
Repurchase of common stock (in shares)           (680,246)                
Issuance of Series H redeemable convertible preferred stock, net of issuance costs         $ 222,482                  
Issuance of Series H redeemable convertible preferred stock, net of issuance costs, shares         16,743,328                  
Accretion of redeemable convertible preferred stock (132,750)                       (132,750)  
Temporary equity, Accretion of redeemable convertible preferred stock 132,800       $ 132,750                  
Net loss (142,978)                       (142,978)  
Temporary Equity, Balance at Dec. 31, 2019 $ 874,332       $ 874,332                  
Temporary Equity, Balance, shares at Dec. 31, 2019 83,568,628       83,568,628                  
Balance at Dec. 31, 2019 $ (573,852)         $ 8             (573,860)  
Balance (in shares) at Dec. 31, 2019           8,650,922                
Issuance of common stock, net of offering costs 2,127   $ 496,510 $ 567,952       $ 24 $ 11 2,127 $ 496,486 $ 567,941    
Issuance of common stock, net of offering costs (in shares)           183,870   24,437,500 10,800,000          
Conversion of redeemable convertible preferred stock to common stock 901,046         $ 86       900,960        
Temporary equity, Conversion of redeemable convertible preferred stock to common stock (in shares)         (85,533,394)                  
Temporary equity, Conversion of redeemable convertible preferred stock to common stock         $ (901,046)                  
Conversion of redeemable convertible preferred stock to common stock (in shares)           85,533,394                
Conversion of redeemable convertible preferred stock warrant to common stock warrant 21,873                 21,873        
Stock-based compensation 13,254                 13,254        
Exercise of stock options $ 2,341         $ 1       2,340        
Exercise of stock options (in shares) 598,406         598,406                
Exercise of common stock warrants (in shares)           636,112                
Vesting of restricted stock awards/units $ 3,383         $ 2       3,381        
Vesting of restricted stock awards/units (in shares)           3,249,346 237,334              
Repurchase of common stock (1,818)                 (606)     (1,212)  
Repurchase of common stock (in shares)           (200,000)                
Issuance of Series H redeemable convertible preferred stock, net of issuance costs         $ 26,714                  
Issuance of Series H redeemable convertible preferred stock, net of issuance costs, shares         1,964,766                  
Common stock shares withheld to satisfy employee tax withholding obligations (2,915)                 (2,915)        
Common stock shares withheld to satisfy employee tax withholding obligations (in shares)           (82,915)                
Net loss $ (202,799)                       (202,799)  
Temporary Equity, Balance, shares at Dec. 31, 2020 0                          
Balance at Dec. 31, 2020 $ 1,227,102         $ 132       $ 2,004,841     $ (777,871)  
Balance (in shares) at Dec. 31, 2020           134,043,969