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Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) Statement - 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)   1,076        
Exercise of stock options 7,815   7,815      
Employee stock-based compensation expense 269,753   269,753      
Non-employee stock-based compensation expense 720   720      
Net loss (270,687)       (270,687)  
Other comprehensive loss, net (2,328)     (2,328)    
Ending balance (in shares) at Apr. 30, 2018   36,776        
Ending balance at Apr. 30, 2018 (333,728) $ 4 438,200 1,075 (773,007)  
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
Accretion of preferred stock (353)   (353)      
Ending balance (in shares) at Apr. 30, 2018           100,226
Ending balance at Apr. 30, 2018           $ 547,854
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) 2,634 2,634        
Exercise of stock options $ 32,254   32,254      
Settlement of RSUs (in shares)   2,463        
Tax withholding on RSU settlement (in shares)   (1,003)        
Tax withholding on RSU settlement (56,137)   (56,137)      
Employee stock purchase plans (in shares)   231        
Employee stock purchase plans 10,563   10,563      
Employee stock-based compensation expense 43,669   43,669      
Non-employee stock-based compensation expense 34   34      
Net loss (45,722)       (45,722)  
Other comprehensive loss, net (1,293)     (1,293)    
Ending balance (in shares) at Apr. 30, 2019   173,628        
Ending balance at Apr. 30, 2019 597,682 $ 17 $ 1,575,471 $ (3,258) $ (974,548)  
Increase (Decrease) in Temporary Equity [Roll Forward]            
Accretion of preferred stock $ 0