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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Notes Receivable From Stockholders
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Common stock, beginning balance (in shares) at Jul. 31, 2018   119,764,000        
Beginning balance at Jul. 31, 2018 $ 240,236 $ 119 $ 438,392 $ (2,051) $ (124) $ (196,100)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock upon exercise of stock options (in shares)   3,511,000        
Issuance of common stock upon exercise of stock options 15,493 $ 4 15,489      
Issuance of common stock under the employee stock purchase plan (in shares)   627,000        
Issuance of common stock in connection with employee stock purchase plan 8,691 $ 1 8,690      
Vesting of restricted stock units (in shares)   3,000        
Vesting of restricted stock units 0          
Vesting of early exercised common stock options 567   567      
Stock-based compensation 20,813   20,813      
Unrealized net gains on available-for-sale securities 65       65  
Net loss (11,143)         (11,143)
Adjustment to initial public offering costs 300   300      
Repurchases of unvested common stock (in shares)   (8,000)        
Repurchases of unvested common stock 0          
Repayments of principal amount on notes receivable from stockholders 1,905     1,905    
Accrued interest on notes receivable from stockholders, net of repayments 146     146    
Common stock, ending balance (in shares) at Jan. 31, 2019   123,897,000        
Ending balance at Jan. 31, 2019 277,073 $ 124 483,951 0 (59) (206,943)
Common stock, beginning balance (in shares) at Oct. 31, 2018   122,106,000        
Beginning balance at Oct. 31, 2018 252,178 $ 122 455,761   (317) (203,388)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock upon exercise of stock options (in shares)   1,161,000        
Issuance of common stock upon exercise of stock options 5,697 $ 1 5,696      
Issuance of common stock under the employee stock purchase plan (in shares)   627,000        
Issuance of common stock in connection with employee stock purchase plan 8,691 $ 1 8,690      
Vesting of restricted stock units (in shares)   3,000        
Vesting of restricted stock units 0          
Vesting of early exercised common stock options 277   277      
Stock-based compensation 13,227   13,227      
Unrealized net gains on available-for-sale securities 258       258  
Net loss (3,555)         (3,555)
Adjustment to initial public offering costs 300   300      
Common stock, ending balance (in shares) at Jan. 31, 2019   123,897,000        
Ending balance at Jan. 31, 2019 $ 277,073 $ 124 483,951 0 (59) (206,943)
Common stock, beginning balance (in shares) at Jul. 31, 2019 127,253 127,253,000        
Beginning balance at Jul. 31, 2019 $ 308,558 $ 127 532,618 0 268 (224,455)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock upon exercise of stock options (in shares) 1,220,000 1,220,000        
Issuance of common stock upon exercise of stock options $ 6,758 $ 2 6,756      
Issuance of common stock under the employee stock purchase plan (in shares)   284,000        
Issuance of common stock in connection with employee stock purchase plan 5,334   5,334      
Vesting of restricted stock units (in shares)   509,000        
Vesting of restricted stock units 0          
Vesting of early exercised common stock options 262   262      
Stock-based compensation 44,259   44,259      
Unrealized net gains on available-for-sale securities 223       223  
Net loss $ (46,230)         (46,230)
Common stock, ending balance (in shares) at Jan. 31, 2020 129,266 129,266,000        
Ending balance at Jan. 31, 2020 $ 319,164 $ 129 589,229 0 491 (270,685)
Common stock, beginning balance (in shares) at Oct. 31, 2019   127,926,000        
Beginning balance at Oct. 31, 2019 314,052 $ 128 555,019   436 (241,531)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock upon exercise of stock options (in shares)   675,000        
Issuance of common stock upon exercise of stock options 3,699 $ 1 3,698      
Issuance of common stock under the employee stock purchase plan (in shares)   284,000        
Issuance of common stock in connection with employee stock purchase plan 5,334   5,334      
Vesting of restricted stock units (in shares)   381,000        
Vesting of restricted stock units 0          
Vesting of early exercised common stock options 131   131      
Stock-based compensation 25,047   25,047      
Unrealized net gains on available-for-sale securities 55       55  
Net loss $ (29,154)         (29,154)
Common stock, ending balance (in shares) at Jan. 31, 2020 129,266 129,266,000        
Ending balance at Jan. 31, 2020 $ 319,164 $ 129 $ 589,229 $ 0 $ 491 $ (270,685)