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Consolidated Statement of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Revision of Prior Period, Accounting Standards Update, Adjustment
Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Revision of Prior Period, Accounting Standards Update, Adjustment
Redeemable Convertible Preferred Stock
Beginning balance (in shares) at Jan. 31, 2018                 100,226,000
Beginning balance at Jan. 31, 2018                 $ 547,501
Redeemable Convertible Preferred Stock                  
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares)                 (100,226,000)
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering                 $ (547,854)
Accretion of preferred stock $ (353)               $ 353
Ending balance (in shares) at Jan. 31, 2019                 0
Ending balance at Jan. 31, 2019                 $ 0
Beginning balance (in shares) at Jan. 31, 2018     35,700,000            
Beginning balance at Jan. 31, 2018 (338,648)   $ 4 $ 160,265   $ 3,403 $ (502,320)    
Total Stockholders’ Equity (Deficit)                  
Issuance of common stock in connection with initial public offering, net of offering costs (in shares)     19,314,000            
Issuance of common stock in connection with initial public offering, net of offering costs 524,979   $ 2 524,977          
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares)     100,350,000            
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          
Equity component of convertible senior notes issuance 131,331     131,331          
Purchase of capped calls related to issuance of convertible senior notes (67,563)     (67,563)          
Exercise of stock options (in shares)     5,791,000            
Exercise of stock options 50,211     50,211          
Settlement of RSUs (in shares)     8,126,000            
Settlement of RSUs 0   $ 1 (1)          
Tax withholding on net share settlement of RSUs and employee stock purchase plan (215,332)     (215,332)          
Employee stock-based compensation expense 411,803     411,803          
Non-employee stock-based compensation expense 1,058     1,058          
Accretion of preferred stock (353)     (353)          
Exercise of common stock warrants (in shares)     22,000            
Net loss (426,458)           (426,458)    
Other comprehensive income, net (5,368)         (5,368)      
Ending balance (in shares) at Jan. 31, 2019     169,303,000            
Ending balance at Jan. 31, 2019 $ 614,362 $ (48) $ 17 1,545,088   (1,965) (928,778) $ (48)  
Total Stockholders’ Equity (Deficit)                  
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member                
Accretion of preferred stock $ 0                
Ending balance at Jan. 31, 2020 0                
Total Stockholders’ Equity (Deficit)                  
Exercise of stock options (in shares)     6,737,000            
Exercise of stock options 72,177   $ 1 72,176          
Settlement of RSUs (in shares)     4,706,000            
Settlement of RSUs 0                
Tax withholding on net share settlement of RSUs and employee stock purchase plan (166,504)     (166,504)          
Employee stock purchase plan (in shares)     508,000            
Employee stock purchase plan 23,872     23,872          
Employee stock-based compensation expense 210,535     210,535          
Net loss (208,359)           (208,359)    
Other comprehensive income, net 292         292      
Ending balance (in shares) at Jan. 31, 2020     181,254,000            
Ending balance at Jan. 31, 2020 546,327   $ 18 1,685,167 $ 0 (1,673) (1,137,185)    
Redeemable Convertible Preferred Stock                  
Accretion of preferred stock 0                
Ending balance at Jan. 31, 2021 3,390                
Total Stockholders’ Equity (Deficit)                  
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering (in shares)     4,698,000            
Conversion of redeemable convertible preferred stock to common stock in connection with initial public offering     $ 1            
Reclassification to mezzanine equity for convertible senior notes due in 2023 (3,390)     (3,390)          
Equity component of convertible senior notes issuance 63,268     63,268          
Purchase of capped calls related to issuance of convertible senior notes (31,395)     (31,395)          
Issuance of common stock as consideration for acquisition (in shares)     247,000            
Issuance of common stock as consideration for acquisition $ 48,361     48,361          
Exercise of stock options (in shares) 2,072,000   2,072,000            
Exercise of stock options $ 24,305     24,305          
Settlement of RSUs (in shares)     4,072,000            
Settlement of RSUs 0                
Tax withholding on net share settlement of RSUs and employee stock purchase plan (377,590)     (376,542) (1,048)        
Employee stock purchase plan (in shares)     464,000            
Employee stock purchase plan 29,859     29,859          
Employee stock-based compensation expense 294,554     294,554          
Net loss (243,267)           (243,267)    
Other comprehensive income, net 6,637         6,637      
Ending balance (in shares) at Jan. 31, 2021     192,807,000            
Ending balance at Jan. 31, 2021 325,737   $ 19 1,702,254 $ (1,048) $ 4,964 $ (1,380,452)    
Total Stockholders’ Equity (Deficit)                  
Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments $ (31,932)     $ (31,933)