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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Common Stock and Additional Paid-In Capital:
Accumulated Deficit:
Accumulated Deficit:
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income:
Beginning balance at Dec. 31, 2017 $ 206 $ 583 $ (377) $ 2 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock from exercise of stock options   7      
Issuance of common stock for employee stock purchase plan   7      
Stock based compensation expense   44      
Net income 192   192    
Repurchase of common stock     (61)    
Awards effectively repurchased for required employee withholding taxes     (22)    
Other comprehensive income 0       0
Ending balance at Dec. 31, 2018 375 641 (266) 0 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   9      
Stock based compensation expense   42      
Net income 212   212    
Repurchase of common stock     (140)    
Awards effectively repurchased for required employee withholding taxes     (25)    
Other comprehensive income 0       0
Ending balance at Dec. 31, 2019 475 694 (219) $ (1) 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   9      
Stock based compensation expense   44      
Net income 272   272    
Repurchase of common stock     (178)    
Awards effectively repurchased for required employee withholding taxes     (18)    
Other comprehensive income 4       4
Ending balance at Dec. 31, 2020 $ 607 $ 747 $ (144)   $ 4