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CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
Total
Series B Redeemable Convertible Preferred Stock
Redeemable Convertible Preferred Stock
Common Stock
Class A Common Stock
Common Stock
Class B Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance (in shares) at Jan. 31, 2017 59,465,439              
Beginning balance at Jan. 31, 2017 $ 227,954,000              
Increase (Decrease) in Temporary Equity [Roll Forward]                
Issuance of Series B redeemable convertible preferred stock upon net exercise of warrants (in shares)   26,201            
Issuance of Series B redeemable convertible preferred stock upon net exercise of warrants   $ 408,000            
Conversion of convertible preferred stock to common stock in connection with initial public offering (in shares)     (59,491,640)   59,491,640      
Conversion of convertible preferred stock to common stock in connection with initial public offering $ 228,362,000   $ (228,362,000)   $ 6,000 $ 228,356,000    
Ending balance (in shares) at Jan. 31, 2018 0              
Ending balance at Jan. 31, 2018 $ 0              
Beginning balance (in shares) at Jan. 31, 2017       0 20,293,338      
Beginning balance at Jan. 31, 2017 (212,361,000)     $ 0 $ 2,000 44,469,000 $ (167,000) $ (256,665,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options and other activity, net (in shares)       8,274,599 900,517      
Issuance of common stock upon exercise of stock options and other activity, net 34,698,000     $ 1,000   34,697,000    
Issuance of common stock upon net exercise of warrant (in shares)         168,750      
Issuance of common stock in connection with initial public offering, net of underwriting discounts and issuance costs (in shares)       12,650,000        
Issuance of common stock in connection with initial public offering, net of underwriting discounts and issuance costs 194,345,000     $ 1,000   194,344,000    
Conversion of convertible preferred stock to common stock in connection with initial public offering (in shares)     (59,491,640)   59,491,640      
Conversion of convertible preferred stock to common stock in connection with initial public offering 228,362,000   $ (228,362,000)   $ 6,000 228,356,000    
Issuance of common stock and restricted stock in connection with acquisition (in shares)         1,598,500      
Issuance of common stock and restricted stock in connection with acquisition 3,652,000         3,652,000    
Issuance of common stock pursuant to charitable donation (in shares)       24,287        
Issuance of common stock pursuant to charitable donation 708,000 [1]         708,000    
Issuance of common stock under employee stock purchase plan (in shares)       569,373        
Issuance of common stock under employee stock purchase plan 8,369,000         8,369,000    
Conversion of Class B common stock to Class A common stock (in shares)       49,091,639 (49,091,639)      
Conversion of Class B common stock to Class A common stock 0     $ 5,000 $ (5,000)      
Stock-based compensation 50,858,000         50,858,000    
Other comprehensive income 558,000           558,000  
Net loss (109,849,000) [1]     $ (31,980,000) $ (77,869,000)     (109,849,000)
Ending balance (in shares) at Jan. 31, 2018       70,609,898 33,361,106      
Ending balance at Jan. 31, 2018 $ 199,340,000     $ 7,000 $ 3,000 565,653,000 391,000 (366,714,000)
Ending balance (in shares) at Jan. 31, 2019 0              
Ending balance at Jan. 31, 2019 $ 0              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options and other activity, net (in shares)       6,465,957 104,084      
Issuance of common stock upon exercise of stock options and other activity, net 37,611,000     $ 1,000   37,610,000    
Issuance of common stock pursuant to charitable donation (in shares)       20,000        
Issuance of common stock pursuant to charitable donation 1,008,000 [1]         1,008,000    
Issuance of common stock under employee stock purchase plan (in shares)       615,210        
Issuance of common stock under employee stock purchase plan 13,727,000         13,727,000    
Issuance of common stock for settlement of RSUs (in shares)       976,248        
Conversion of Class B common stock to Class A common stock (in shares)       22,406,009 (22,406,009)      
Conversion of Class B common stock to Class A common stock 0     $ 2,000 $ (2,000)      
Equity component of convertible senior notes, net of issuance costs 77,631,000         77,631,000    
Issuance of warrants related to 2023 convertible senior notes 52,440,000         52,440,000    
Purchases of hedges related to 2023 convertible senior notes (80,040,000)         (80,040,000)    
Stock-based compensation 76,867,000         76,867,000    
Other comprehensive income (710,000)           (710,000)  
Net loss (125,497,000) [1]     $ (107,926,000) $ (17,571,000)     (125,497,000)
Ending balance (in shares) at Jan. 31, 2019       101,093,322 11,059,181      
Ending balance at Jan. 31, 2019 $ 252,377,000 [2]     $ 10,000 $ 1,000 744,896,000 (319,000) (492,211,000)
Ending balance (in shares) at Jan. 31, 2020 0              
Ending balance at Jan. 31, 2020 $ 0              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options and other activity, net (in shares) 5,422,281     5,323,410 100,007      
Issuance of common stock upon exercise of stock options and other activity, net $ 45,732,000     $ 1,000   45,731,000    
Issuance of common stock pursuant to charitable donation (in shares)       15,000        
Issuance of common stock pursuant to charitable donation 1,746,000         1,746,000    
Issuance of common stock under employee stock purchase plan (in shares)       322,795        
Issuance of common stock under employee stock purchase plan $ 18,767,000         $ 18,767,000    
Issuance of common stock for settlement of RSUs (in shares) 0     1,716,222   0    
Issuance of common stock for settlement of bonus (in shares)       34,600   2,809,000    
Issuance of stock for settlement of bonus $ 2,809,000              
Conversion of Class B common stock to Class A common stock (in shares)       2,511,409 (2,511,409)      
Conversion of Class B common stock to Class A common stock 0       $ 0      
Equity component of convertible senior notes, net of issuance costs 217,347,000         $ 217,347,000    
Equity component of early extinguishment of 2023 convertible senior notes (26,713,000)     $ 2,973,311   (26,713,000)    
Proceeds from hedges related to 2023 convertible senior notes 405,851,000         405,851,000    
Payments for warrants related to 2023 convertible senior notes (358,622,000)         (358,622,000)    
Purchases of hedges related to 2023 convertible senior notes (74,094,000)         (74,094,000)    
Stock-based compensation 127,846,000         127,846,000    
Other comprehensive income 1,211,000           1,211,000  
Net loss (208,913,000)     $ (192,138,000) $ (16,775,000)      
Ending balance (in shares) at Jan. 31, 2020       113,990,069 8,647,779      
Ending balance at Jan. 31, 2020 $ 405,344,000     $ 11,000 $ 1,000 $ 1,105,564,000 $ 892,000 $ (701,124,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Vesting of RSUs (in shares) 12,359,302              
[1] Adjusted for adoption of ASC 842. See Note 2.
[2] Adjusted for adoption of ASC 842. See Note 2.