Stockholders' Equity (Summary of Stock Option Activity) (Details) - $ / shares shares in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Performance-based stock options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding at December 31, 2021	304
Number of shares, Outstanding at March 31, 2022	304	304
Weighted average exercise price, Outstanding at December 31, 2021	$ 4.71
Weighted average exercise price, Outstanding at March 31, 2022	$ 4.71	$ 4.71
$1.16 – 46.37 [Member] \| Time-based stock option [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding at December 31, 2021	12,159
Number of shares, Outstanding at March 31, 2022		12,159
Exercise price, lower range		$ 1.16
Exercise price, upper range		46.37
Weighted average exercise price, Outstanding at December 31, 2021	$ 11.38
Weighted average exercise price, Outstanding at March 31, 2022		11.38
$10.18 – 16.58 [Member] \| Time-based stock option [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Granted	3,798
Exercise price, lower range	$ 10.18
Exercise price, upper range	16.58
Weighted average exercise price, Granted	11.76
$2.05 – $4.90 [Member] \| Performance-based stock options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range		4.71
$4.71 - $4.90 [Member] \| Performance-based stock options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range	4.71
Exercise price, upper range	$ 4.90	$ 4.90
$1.16 - 8.90 [Member] \| Time-based stock option [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Exercised	(178)
Exercise price, lower range	$ 1.16
Exercise price, upper range	8.90
Weighted average exercise price, Exercised	$ 3.38
$2.47 – 46.37 [Member] \| Time-based stock option [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Canceled	(232)
Exercise price, lower range	$ 2.47
Exercise price, upper range	46.37
Weighted average exercise price, Canceled	$ 27.74
$1.16 – 46.37 [Member] \| Time-based stock option [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding at March 31, 2022	15,547
Exercise price, lower range	$ 1.16
Exercise price, upper range	46.37
Weighted average exercise price, Outstanding at March 31, 2022	$ 11.32

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.

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

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