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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, 2021	Dec. 31, 2020
$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
Number of shares, Balances, March 31, 2021		14,638
Exercise price, lower range		$ 1.16
Exercise price, upper range		20.90
Weighted average exercise price, Balances, December 31, 2020	$ 5.53
Weighted average exercise price, Balances, March 31, 2021		$ 5.53
$31.18 – 46.37 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options granted	1,697
Exercise price, lower range	$ 31.18
Exercise price, upper range	46.37
Weighted average exercise price, Options granted	$ 37.37
$1.16 – 15.98 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options exercised	(3,558)
Exercise price, lower range	$ 1.16
Exercise price, upper range	15.98
Weighted average exercise price, Options exercised	$ 5.43
$2.54 – 5.27 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options canceled	(445)
Exercise price, lower range	$ 2.54
Exercise price, upper range	5.27
Weighted average exercise price, Options canceled	$ 3.79
$1.16 – 46.37 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Balances, March 31, 2021	12,332
Exercise price, lower range	$ 1.16
Exercise price, upper range	46.37
Weighted average exercise price, Balances, March 31, 2021	$ 10.00

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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-SubTopic 10
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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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