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Stockholders' Equity (Summary Of Stock Option Activity) (Details) - Stock Options [Member] - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Additional shares reserved, Shares available for grant 4,634  
$1.16 – 16.00 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Balances, December 31, 2016, Shares available for grant 6,471  
Balances, December 31, 2017, Shares available for grant 6,795 6,471
Balances, December 31, 2016, Number of shares 22,501  
Balances, December 31, 2017, Number of shares 25,404 22,501
Exercise price, lower range $ 1.16 $ 1.16
Exercise price, upper range 16.00 16.00
Balances, December 31, 2016, Weighted average exercise price 6.30  
Balances, December 31, 2017, Weighted average exercise price $ 6.10 $ 6.30
$2.66 – 5.37 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options granted, Shares available for grant (6,239)  
Options granted, Number of shares 6,239  
Exercise price, lower range $ 2.66  
Exercise price, upper range 5.37  
Options granted, Weighted average exercise price $ 4.84  
$1.16 – 5.27 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options exercised, Number of shares (1,407)  
Exercise price, lower range $ 1.16  
Exercise price, upper range 5.27  
Options exercised, Weighted average exercise price $ 2.55  
$1.16 – 16.00 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options canceled, Shares available for grant 1,929  
Options canceled, Number of shares (1,929)  
Exercise price, lower range $ 1.16  
Exercise price, upper range 16.00  
Options canceled, Weighted average exercise price $ 7.00