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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Millions
Total
Common Stock and Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2018 $ 375 $ 641 $ (266) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock from exercise of stock options   2    
Issuance of common stock for employee stock purchase plan   4    
Stock-based compensation expense   20    
Net income 109   109  
Repurchase of common stock     (62)  
Awards effectively repurchased for required employee withholding taxes     (10)  
Other comprehensive income, net of income taxes 1     1
Ending balance at Jun. 30, 2019 439 667 (229) 1
Beginning balance at Mar. 31, 2019 406 651 (245) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock from exercise of stock options   1    
Issuance of common stock for employee stock purchase plan   4    
Stock-based compensation expense   11    
Net income 46   46  
Repurchase of common stock     (24)  
Awards effectively repurchased for required employee withholding taxes     (6)  
Other comprehensive income, net of income taxes 1     1
Ending balance at Jun. 30, 2019 439 667 (229) 1
Beginning balance at Dec. 31, 2019 475 694 (219) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock from exercise of stock options   0    
Issuance of common stock for employee stock purchase plan   5    
Stock-based compensation expense   20    
Net income 217   217  
Repurchase of common stock (100)   (100)  
Awards effectively repurchased for required employee withholding taxes     (6)  
Other comprehensive income, net of income taxes 5     5
Ending balance at Jun. 30, 2020 616 719 (108) 5
Beginning balance at Mar. 31, 2020 533 703 (172) 2
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock from exercise of stock options   0    
Issuance of common stock for employee stock purchase plan   5    
Stock-based compensation expense   11    
Net income 126   126  
Repurchase of common stock     (60)  
Awards effectively repurchased for required employee withholding taxes     (2)  
Other comprehensive income, net of income taxes 3     3
Ending balance at Jun. 30, 2020 $ 616 $ 719 $ (108) $ 5