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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
Balance at Dec. 31, 2017 $ 206 $ 583 $ (377) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock from exercise of stock options   6    
Issuance of common stock for employee stock purchase plan   3    
Stock-based compensation expense   31    
Net income 163   163  
Repurchase of common stock     (47)  
Awards effectively repurchased for required employee withholding taxes     (15)  
Other comprehensive income       0
Balance at Sep. 30, 2018 350 623 (273) 0
Balance at Jun. 30, 2018 309 611 (302) 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   0    
Stock-based compensation expense   12    
Net income 51   51  
Repurchase of common stock     (17)  
Awards effectively repurchased for required employee withholding taxes     (5)  
Other comprehensive income       0
Balance at Sep. 30, 2018 350 623 (273) 0
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   29    
Net income 164   164  
Repurchase of common stock (84)   (84)  
Awards effectively repurchased for required employee withholding taxes     (14)  
Other comprehensive income       1
Balance at Sep. 30, 2019 477 676 (200) 1
Balance at Jun. 30, 2019 439 667 (229) 1
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   0    
Stock-based compensation expense   9    
Net income 55   55  
Repurchase of common stock     (22)  
Awards effectively repurchased for required employee withholding taxes     (4)  
Other comprehensive income       0
Balance at Sep. 30, 2019 $ 477 $ 676 $ (200) $ 1