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Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Retained Earnings
Convertible preferred stock, beginning balance at Jul. 30, 2016 $ 42,222        
Convertible preferred stock, beginning balance (in shares) at Jul. 30, 2016 59,511,055        
Convertible preferred stock, ending balance at Jul. 29, 2017 $ 42,222        
Convertible preferred stock, ending balance (in shares) at Jul. 29, 2017 59,511,055        
Stockholders' equity, beginning balance at Jul. 30, 2016 $ 49,947 $ 0 $ 10,938 $ 0 $ 39,009
Stockholders' equity, beginning balance (in shares) at Jul. 30, 2016   25,873,434      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Compensation expense related to certain stock sales by current and former employees 9,699   9,699    
Issuance of common stock upon exercise of stock options 1,704   1,704    
Issuance of common stock upon exercise of stock options, net of early exercised options (in shares)   1,462,434      
Vesting of early exercised options 891 $ 1 890    
Repurchase of common stock (3,557)       (3,557)
Repurchase of common stock (in shares)   (501,333)      
Stock-based compensation 3,709   3,709    
Excess tax benefit related to stock-based compensation 62   62    
Net income (594)       (594)
Total other comprehensive income (loss), net of tax 0        
Stockholders' equity, ending balance at Jul. 29, 2017 61,861 $ 1 27,002 0 34,858
Stockholders' equity, ending balance (in shares) at Jul. 29, 2017   26,834,535      
Increase (Decrease) in Temporary Equity [Roll Forward]          
Convertible preferred stock, issuance of Class B common stock upon conversion of convertible preferred stock $ (42,222)        
Convertible preferred stock, issuance of Class B common stock upon conversion of convertible preferred stock (in shares) (59,511,055)        
Convertible preferred stock, ending balance at Jul. 28, 2018 $ 0        
Convertible preferred stock, ending balance (in shares) at Jul. 28, 2018 0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock upon exercise of stock options $ 6,384   6,384    
Issuance of common stock upon exercise of stock options, net of early exercised options (in shares)   2,192,430      
Vesting of early exercised options 988   988    
Repurchase of common stock 0        
Repurchase of common stock (in shares)   (19,479)      
Stock-based compensation 16,286   16,286    
Net income 44,900       44,900
Issuance of Class A common stock upon initial public offering, net of offering costs 127,033   127,033    
Issuance of Class A common stock upon initial public offering, net of offering costs (in shares)   9,175,557      
Issuance of Class B common stock upon conversion of convertible preferred stock 42,222 $ 1 42,221    
Issuance of Class B common stock upon conversion of convertible preferred stock (in shares)   59,511,055      
Reclassification of warrant liability to additional paid-in capital upon the initial public offering 15,994   15,994    
Reclassification of warrant liability to additional paid-in capital upon the initial public offering (in shares)   1,066,225      
Issuance of Class A common stock upon settlement of restricted stock units, net of tax withholdings (596)   (596)    
Issuance of Class A restricted stock units, net of tax withholdings (in shares)   39,538      
Total other comprehensive income (loss), net of tax 0        
Stockholders' equity, ending balance at Jul. 28, 2018 315,072 $ 2 235,312 0 79,758
Stockholders' equity, ending balance (in shares) at Jul. 28, 2018   98,799,861      
Convertible preferred stock, ending balance at Aug. 03, 2019 $ 0        
Convertible preferred stock, ending balance (in shares) at Aug. 03, 2019 0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock upon exercise of stock options $ 13,693   13,693    
Issuance of common stock upon exercise of stock options, net of early exercised options (in shares)   2,200,393      
Vesting of early exercised options 209   209    
Stock-based compensation 37,045   37,045    
Net income 36,881       36,881
Issuance of Class A common stock upon settlement of restricted stock units, net of tax withholdings (6,748)   (6,748) 0 0
Issuance of Class A restricted stock units, net of tax withholdings (in shares)   397,226      
Total other comprehensive income (loss), net of tax (187)     (187)  
Stockholders' equity, ending balance at Aug. 03, 2019 $ 396,000 $ 2 $ 279,511 $ (187) $ 116,674
Stockholders' equity, ending balance (in shares) at Aug. 03, 2019   101,397,480