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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Millions
Total
Common Stock and Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2015   70,371,425    
Balance at Dec. 31, 2015 $ 8 $ 494 $ (485) $ (1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 61   61  
Other comprehensive income $ 1     1
Issuance of common stock from vested restricted stock units (in shares)   695,253    
Issuance of common stock for employee stock purchase plan (in shares) 283,644 283,644    
Issuance of common stock for employee stock purchase plan $ 4 $ 4    
Issuance of common stock from exercise of stock options (in shares)   1,297,812    
Issuance of common stock from exercise of stock options 5 $ 5    
Stock-based compensation expense $ 26 $ 26    
Repurchase of common stock (in shares) (3,414,675) (3,414,675)    
Repurchase of common stock $ (72)   (72)  
Awards effectively repurchased for required employee withholding taxes (in shares)   (217,769)    
Awards effectively repurchased for required employee withholding taxes (4)   (4)  
Excess tax benefit from equity incentive plan activity 6 $ 6    
Balance (in shares) at Dec. 31, 2016   69,015,690    
Balance at Dec. 31, 2016 35 $ 535 (500) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 178   178  
Other comprehensive income $ 0      
Issuance of common stock from vested restricted stock units (in shares)   1,020,352    
Issuance of common stock for employee stock purchase plan (in shares) 224,928 224,928    
Issuance of common stock for employee stock purchase plan $ 5 $ 5    
Issuance of common stock from exercise of stock options (in shares)   1,441,957    
Issuance of common stock from exercise of stock options 11 $ 11    
Stock-based compensation expense $ 32 $ 32    
Repurchase of common stock (in shares) (1,549,434) (1,549,434)    
Repurchase of common stock $ (44)   (44)  
Awards effectively repurchased for required employee withholding taxes (in shares)   (335,101)    
Awards effectively repurchased for required employee withholding taxes (11)   (11)  
Balance (in shares) at Dec. 31, 2017   69,818,392    
Balance at Dec. 31, 2017 206 $ 583 (377) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 192   192  
Other comprehensive income $ 0      
Issuance of common stock from vested restricted stock units (in shares)   1,634,271    
Issuance of common stock for employee stock purchase plan (in shares) 175,966 175,966    
Issuance of common stock for employee stock purchase plan $ 7 $ 7    
Issuance of common stock from exercise of stock options (in shares) 617,157 617,157    
Issuance of common stock from exercise of stock options $ 7 $ 7    
Stock-based compensation expense $ 44 $ 44    
Repurchase of common stock (in shares) (1,190,995) (1,190,995)    
Repurchase of common stock $ (61)   (61)  
Awards effectively repurchased for required employee withholding taxes (in shares)   (458,232)    
Awards effectively repurchased for required employee withholding taxes (22)   (22)  
Balance (in shares) at Dec. 31, 2018   70,596,559    
Balance at Dec. 31, 2018 375 $ 641 (266) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Cumulative effect of accounting change $ 2   $ 2