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Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Redeemable Convertible Preferred Stock
Beginning balance (in shares) at Jan. 31, 2018   35,700        
Beginning balance at Jan. 31, 2018 $ (338,648) $ 4 $ 160,265 $ 3,403 $ (502,320)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   1,400        
Exercise of stock options 10,318   10,318      
Employee stock-based compensation expense 310,133   310,133      
Non-employee stock-based compensation expense 833   833      
Accretion of preferred stock (353)   (353)      
Issuance of common stock in connection with initial public offering, net of offering costs (in shares)   19,314        
Issuance of common stock in connection with initial public offering, net of offering costs 525,299 $ 2 525,297      
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares)   100,350        
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering 547,854 $ 10 547,844      
Conversion of preferred stock warrant to common stock warrant in connection with initial public offering 848   848      
Exercise of warrants (in shares)   22        
Exercise of warrants 0          
Net loss (307,401)       (307,401)  
Other comprehensive income (loss), net (5,413)     (5,413)    
Ending balance (in shares) at Jul. 31, 2018   156,786        
Ending balance at Jul. 31, 2018 743,470 $ 16 1,555,185 (2,010) (809,721)  
Beginning balance (in shares) at Jan. 31, 2018           100,226
Beginning balance at Jan. 31, 2018           $ 547,501
Increase (Decrease) in Temporary Equity [Roll Forward]            
Accretion of preferred stock (353)         $ (353)
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares)           (100,226)
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering           $ (547,854)
Ending balance (in shares) at Jul. 31, 2018           0
Ending balance at Jul. 31, 2018           $ 0
Beginning balance (in shares) at Apr. 30, 2018   36,776        
Beginning balance at Apr. 30, 2018 (333,728) $ 4 438,200 1,075 (773,007)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   324        
Exercise of stock options 2,503   2,503      
Employee stock-based compensation expense 40,380   40,380      
Non-employee stock-based compensation expense 113   113      
Issuance of common stock in connection with initial public offering, net of offering costs (in shares)   19,314        
Issuance of common stock in connection with initial public offering, net of offering costs 525,299 $ 2 525,297      
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares)   100,350        
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering 547,854 $ 10 547,844      
Conversion of preferred stock warrant to common stock warrant in connection with initial public offering 848   848      
Exercise of warrants (in shares)   22        
Exercise of warrants 0          
Net loss (36,714)       (36,714)  
Other comprehensive income (loss), net (3,085)     (3,085)    
Ending balance (in shares) at Jul. 31, 2018   156,786        
Ending balance at Jul. 31, 2018 743,470 $ 16 1,555,185 (2,010) (809,721)  
Beginning balance (in shares) at Apr. 30, 2018           100,226
Beginning balance at Apr. 30, 2018           $ 547,854
Increase (Decrease) in Temporary Equity [Roll Forward]            
Accretion of preferred stock 0          
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares)           (100,226)
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering           $ (547,854)
Ending balance (in shares) at Jul. 31, 2018           0
Ending balance at Jul. 31, 2018           $ 0
Beginning balance (in shares) at Jan. 31, 2019   169,303        
Beginning balance at Jan. 31, 2019 $ 614,362 $ 17 1,545,088 (1,965) (928,778)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares) 3,869 3,869        
Exercise of stock options $ 42,448   42,448      
Settlement of RSUs (in shares)   4,144        
Settlement of RSUs 0 $ 1 (1)      
Tax withholding on RSU settlement (in shares)   (1,594)        
Tax withholding on RSU settlement (85,978)   (85,978)      
Employee stock purchase plan (in shares)   231        
Employee stock purchase plan 10,563   10,563      
Employee stock-based compensation expense 100,597   100,597      
Non-employee stock-based compensation expense 69   69      
Net loss (114,354)       (114,354)  
Other comprehensive income (loss), net (980)     (980)    
Ending balance (in shares) at Jul. 31, 2019   175,953        
Ending balance at Jul. 31, 2019 566,679 $ 18 1,612,786 (2,945) (1,043,180)  
Increase (Decrease) in Temporary Equity [Roll Forward]            
Accretion of preferred stock 0          
Beginning balance (in shares) at Apr. 30, 2019   173,628        
Beginning balance at Apr. 30, 2019 597,682 $ 17 1,575,471 (3,258) (974,548)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   1,235        
Exercise of stock options 10,194   10,194      
Settlement of RSUs (in shares)   1,681        
Settlement of RSUs 0 $ 1 (1)      
Tax withholding on RSU settlement (in shares)   (591)        
Tax withholding on RSU settlement (29,841)   (29,841)      
Employee stock-based compensation expense 56,928   56,928      
Non-employee stock-based compensation expense 35   35      
Net loss (68,632)       (68,632)  
Other comprehensive income (loss), net 313     313    
Ending balance (in shares) at Jul. 31, 2019   175,953        
Ending balance at Jul. 31, 2019 566,679 $ 18 $ 1,612,786 $ (2,945) $ (1,043,180)  
Increase (Decrease) in Temporary Equity [Roll Forward]            
Accretion of preferred stock $ 0