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Stockholders' Equity (Summary of Stock Option Activity) (Details) - Options outstanding [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options granted
Exercise price, lower range
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]
Number of shares, Balances, December 31, 2018	25,176
Number of shares, Balances, December 31, 2019	22,697	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, December 31, 2019	$ 5.57	$ 5.66
$1.16 – 7.05 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options exercised	(1,199)
Exercise price, lower range	$ 1.16
Exercise price, upper range	7.05
Weighted average exercise price, Options exercised	$ 4.78
$2.54 – 16.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options canceled	(1,280)
Exercise price, lower range	$ 2.54
Exercise price, upper range	16.00
Weighted average exercise price, Options canceled	$ 8.01

X

- Definition

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.

+ References

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Net number of share options (or share units) granted during the period.

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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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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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