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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, 2019	Dec. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares available for grant, Additional shares reserved	7,512
Shares available for grant, Options granted
Number of shares, Options granted
Weighted average exercise price, Options granted
$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, 2018	12,279
Shares available for grant, Balances, March 31, 2019	20,333	12,279
Number of shares, Balances, December 31, 2018	25,176
Number of shares, Balances, March 31, 2019	23,833	25,176
Exercise price, lower range	$ 1.16	$ 1.16
Exercise price, upper range	16.00	16.00
Weighted average exercise price, Balances, December 31, 2018	5.66
Weighted average exercise price, Balances, March 31, 2019	$ 5.58	$ 5.66
$1.16 – 7.05 [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	(801)
Exercise price, lower range	$ 1.16
Exercise price, upper range	7.05
Weighted average exercise price, Options exercised	$ 4.84
$2.54 – 16.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares available for grant, Options canceled	542
Number of shares, Options canceled	(542)
Exercise price, lower range	$ 2.54
Exercise price, upper range	16.00
Weighted average exercise price, Options canceled	$ 10.27

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