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Stockholders' Equity (Summary Of Stock Option Activity) (Details) - Stock Options [Member] - $ / shares shares in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 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, September 30, 2017, Shares available for grant	7,468	6,835
Balances, December 31, 2016, Number of shares	22,501
Balances, September 30, 2017, Number of shares	25,133	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 per share	6.30
Balances, September 30, 2017, Weighted average exercise price per share	$ 6.18	$ 6.30
$3.30 – 5.37 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted, Shares available for grant	(5,600)
Options granted, Number of shares	5,600
Exercise price, lower range	$ 3.30
Exercise price, upper range	5.37
Options granted, Weighted average exercise price per share	$ 5.05
$1.16 – 5.27 [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	(1,369)
Exercise price, lower range	$ 1.16
Exercise price, upper range	5.27
Options exercised, Weighted average exercise price per share	$ 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	1,599
Options canceled, Number of shares	(1,599)
Exercise price, lower range	$ 1.16
Exercise price, upper range	16.00
Options canceled, Weighted average exercise price per share	$ 7.08

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-Publisher FASB
-Name Accounting Standards Codification
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