Stockholders' Equity (Summary of Stock Option Activity) (Details) - Stock Options [Member] - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options granted		0
$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, 2019	22,697,000
Number of shares, Balances, December 31, 2020		22,697,000
Exercise price, lower range	$ 1.16	$ 1.16
Exercise price, upper range	16.00	16.00
Weighted average exercise price, Balances, December 31, 2019	$ 5.57
Weighted average exercise price, Balances, December 31, 2020		$ 5.57
$2.45 – 20.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options granted	2,852,000
Exercise price, lower range	$ 2.45
Exercise price, upper range	20.9
Weighted average exercise price, Options granted	$ 7.20
$1.16 – 15.98 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options exercised	(8,078,000)
Exercise price, lower range	$ 1.16
Exercise price, upper range	15.98
Weighted average exercise price, Options exercised	$ 5.44
$1.16 – 16 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options canceled	(2,833,000)
Exercise price, lower range	$ 1.16
Exercise price, upper range	16
Weighted average exercise price, Options canceled	$ 7.82
$1.16 – 20.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Balances, December 31, 2020	14,638,000
Exercise price, lower range	$ 1.16
Exercise price, upper range	20.90
Weighted average exercise price, Balances, December 31, 2020	$ 5.53

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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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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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No definition available.

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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