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Stockholders' Equity (Summary Of Stock Option Activity) (Details) - Stock Options [Member] - $ / shares
shares in Thousands
3 Months Ended 12 Months Ended
Mar. 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 6,835  
Balances, March 31, 2017, Shares available for grant   6,835
Balances, December 31, 2016, Number of shares 22,501  
Balances, March 31, 2017, Number of shares   22,501
Exercise price, lower range   $ 1.16
Exercise price, upper range   16.00
Balances, December 31, 2015, Weighted average exercise price per share $ 6.30  
Balances, December 31, 2016, Weighted average exercise price per share   $ 6.30
$4.78 – 5.27 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options granted, Shares available for grant (4,708)  
Options granted, Number of shares 4,708  
Exercise price, lower range $ 4.78  
Exercise price, upper range 5.27  
Options granted, Weighted average exercise price per share $ 5.26  
$1.16 – 4.55 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options exercised, Shares available for grant  
Options exercised, Number of shares (114)  
Exercise price, lower range $ 1.16  
Exercise price, upper range 4.55  
Options exercised, Weighted average exercise price per share $ 2.70  
$1.16 – 11.64 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options canceled, Shares available for grant 439  
Options canceled, Number of shares (439)  
Exercise price, lower range $ 1.16  
Exercise price, upper range 11.64  
Options canceled, Weighted average exercise price per share $ 7.34  
$1.16 – 16.00 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Balances, March 31, 2017, Shares available for grant 7,200  
Balances, March 31, 2017, Number of shares 26,656  
Exercise price, lower range $ 1.16  
Exercise price, upper range 16.00  
Balances, December 31, 2016, Weighted average exercise price per share $ 6.11