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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, 2018	Dec. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares available for grant, Additional shares reserved	6,976
$1.16 – 16.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares available for grant, Balances, December 31, 2017	6,795
Shares available for grant, Balances,September 30, 2018	11,438	6,795
Number of shares, Balances, December 31, 2017	25,404
Number of shares, Balances, September 30, 2018	27,397	25,404
Exercise price, lower range	$ 1.16	$ 1.16
Exercise price, upper range	16.00	16.00
Weighted average exercise price, Balances, December 31, 2017	6.10
Weighted average exercise price, Balances, September 30, 2018	$ 5.60	$ 6.10
$2.47 – 4.28 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares available for grant, Options granted	(4,183)
Number of shares, Options granted	4,183
Exercise price, lower range	$ 2.47
Exercise price, upper range	4.28
Weighted average exercise price, Options granted	$ 2.56
$1.16 – 5.27 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares available for grant, Options exercised
Number of shares, Options exercised	(340)
Exercise price, lower range	$ 1.16
Exercise price, upper range	5.27
Weighted average exercise price, Options exercised	$ 2.49
$1.16 – 16.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares available for grant, Options canceled	1,850
Number of shares, Options canceled	(1,850)
Exercise price, lower range	$ 1.16
Exercise price, upper range	16.00
Weighted average exercise price, Options canceled	$ 6.12

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