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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   29    
Net income 164   164  
Repurchase of common stock     (84)  
Awards effectively repurchased for required employee withholding taxes     (14)  
Other comprehensive income 1     1
Ending balance at Sep. 30, 2019 477 676 (200) 1
Beginning 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     0
Ending balance at Sep. 30, 2019 477 676 (200) 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   31    
Net income 250      
Repurchase of common stock (135)   (135)  
Awards effectively repurchased for required employee withholding taxes     (11)  
Other comprehensive income 4     5
Ending balance at Sep. 30, 2020 620 730 (115) 5
Beginning balance at Jun. 30, 2020 616 719 (108) 5
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   11    
Net income 33      
Repurchase of common stock     (35)  
Awards effectively repurchased for required employee withholding taxes     (5)  
Other comprehensive income 0     0
Ending balance at Sep. 30, 2020 $ 620 $ 730 $ (115) $ 5