Stockholders' Equity (Summary of Stock Option Activity) (Details) - Stock Options [Member] - $ / shares shares in Thousands	12 Months Ended
Dec. 31, 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, December 31, 2018	12,279	6,795
Number of shares, Balances, December 31, 2017	25,404
Number of shares, Balances, December 31, 2018	25,176	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, December 31, 2018	$ 5.66	$ 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	(4,204)
Number of shares, Options granted	4,204
Exercise price, lower range	$ 2.47
Exercise price, upper range	4.28
Weighted average exercise price, Options granted	$ 2.57
$1.16 – 7.05 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options exercised	(1,720)
Exercise price, lower range	$ 1.16
Exercise price, upper range	7.05
Weighted average exercise price, Options exercised	$ 3.73
$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	2,712
Number of shares, Options canceled	(2,712)
Exercise price, lower range	$ 1.16
Exercise price, upper range	16.00
Weighted average exercise price, Options canceled	$ 6.19

Additional shares reserved shares available for grant.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Number of share options (or share units) exercised during the current period.

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