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CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Series G Redeemable Convertible Preferred Stock
Series D Redeemable Convertible Preferred Stock
Series E Redeemable Convertible Preferred Stock
Redeemable Convertible Preferred Stock
Redeemable Convertible Preferred Stock
Series G Redeemable Convertible Preferred Stock
Redeemable Convertible Preferred Stock
Series H Redeemable Convertible Preferred Stock
Redeemable Convertible Preferred Stock
Series D Redeemable Convertible Preferred Stock
Redeemable Convertible Preferred Stock
Series E Redeemable Convertible Preferred Stock
Common Stock
Additional Paid-In Capital
Additional Paid-In Capital
Series G Redeemable Convertible Preferred Stock
Additional Paid-In Capital
Series D Redeemable Convertible Preferred Stock
Additional Paid-In Capital
Series E Redeemable Convertible Preferred Stock
Accumulated Other Comprehensive Gain (Loss)
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Balance at beginning of period (in shares) at Dec. 31, 2017           448,686,791                        
Balance at beginning of period at Dec. 31, 2017           $ 1,176,661                        
Increase (Decrease) in Temporary Equity [Roll Forward]                                    
Issuance of redeemable convertible preferred stock, net of issuance costs (in shares)             55,666,004 5,000,000                    
Issuance of redeemable convertible preferred stock, net of issuance costs     $ 51       $ 549,413 $ 111,546         $ 51          
Repurchase of redeemable convertible preferred stock (in shares)                 (269,180) (544,100)                
Repurchase of redeemable convertible preferred stock       $ (2,009) $ (2,118)       $ (704) $ (3,355)       $ (2,009) $ (2,118)      
Conversion of redeemable convertible preferred stock into common stock (in shares)           (508,539,515)         (236,012,913)              
Conversion of redeemable convertible preferred stock into common stock $ 1,833,561         $ (1,833,561)         $ 24 $ 1,833,537            
Balance at end of period (in shares) at Dec. 31, 2018           0                        
Balance at end of period at Dec. 31, 2018           $ 0                        
Balance at beginning of period (in shares) at Dec. 31, 2017                     65,206,999              
Balance at beginning of period at Dec. 31, 2017 (551,365)                   $ 6 71,679       $ (1,157) $ (621,893)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Vesting of restricted common stock (in shares)                     856,135              
Exercise of options to purchase common stock (in shares)                     446,864              
Exercise of options to purchase common stock 1,427                     1,427            
Conversion of redeemable convertible preferred stock into common stock (in shares)           508,539,515         236,012,913              
Conversion of redeemable convertible preferred stock into common stock 1,833,561         $ (1,833,561)         $ 24 1,833,537            
Proceeds of initial public offering, net of issuance costs (in shares)                     26,275,993              
Proceeds of initial public offering, net of issuance costs 563,026                   $ 3 563,023            
Stock-based compensation 72,565                     72,565            
Other comprehensive income, net of tax (163)                             (163)    
Net loss (384,734)                               (384,734)  
Balance at end of period (in shares) at Dec. 31, 2018                     328,798,904              
Balance at end of period at Dec. 31, 2018 $ 1,530,241                   $ 33 2,538,155       (1,320) (1,006,627)  
Balance at end of period (Accounting Standards Update 2014-09) at Dec. 31, 2018   $ 27,984                               $ 27,984
Balance at end of period (Accounting Standards Update 2016-02) at Dec. 31, 2018   $ (3,790)                               $ (3,790)
Balance at end of period (in shares) at Dec. 31, 2019 0         0                        
Balance at end of period at Dec. 31, 2019           $ 0                        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Vesting of restricted common stock (in shares)                     621,432              
Exercise of options to purchase common stock (in shares)                     6,945,306              
Exercise of options to purchase common stock $ 47,259                   $ 1 47,258            
Purchase of common stock under employee stock purchase plan (in shares)                     171,343              
Purchase of common stock under employee stock purchase plan 2,891                     2,891            
Stock-based compensation 81,122                     81,122            
Other comprehensive income, net of tax 3,124                             3,124    
Net loss (514,021)                               (514,021)  
Balance at end of period (in shares) at Dec. 31, 2019                     336,536,985              
Balance at end of period at Dec. 31, 2019 $ 1,174,810                   $ 34 2,669,426       1,804 (1,496,454)  
Balance at end of period (in shares) at Dec. 31, 2020 0         0                        
Balance at end of period at Dec. 31, 2020           $ 0                        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Vesting of restricted common stock (in shares)                     247,349              
Exercise of options to purchase common stock (in shares) 13,888,434                   13,888,434              
Exercise of options to purchase common stock $ 179,643                   $ 1 179,642            
Purchase of common stock under employee stock purchase plan (in shares)                     251,752              
Purchase of common stock under employee stock purchase plan 7,040                     7,040            
Proceeds of initial public offering, net of issuance costs (in shares)                     47,863,158              
Proceeds of initial public offering, net of issuance costs 1,852,725                   $ 5 1,852,720            
Stock-based compensation 93,021                     93,021            
Other comprehensive income, net of tax 1,200                             1,200    
Net loss (747,064)                               (747,064)  
Balance at end of period (in shares) at Dec. 31, 2020                     398,787,678              
Balance at end of period at Dec. 31, 2020 $ 2,561,375                   $ 40 $ 4,801,849       $ 3,004 $ (2,243,518)