Stockholders' Equity (Schedule of Status of Options Granted) (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Number of Options, Outstanding Balance	9,654	10,578
Number of Options, Granted	1,525,000
Number of Options, Exercised
Number of Options, Assumed in business combination	134,371
Number of Options, Forfeited	(3,631)	(302)
Number of Options, Expired	(872)	(622)
Number of Options, Outstanding Balance	1,664,522	9,654	10,578
Number of Options, Vested and expected to vest	1,664,522
Number of Options, Exercisable
Weighted Average Exercise Price, Outstanding Balance	$ 418.10	$ 411.60
Weighted Average Exercise Price, Granted	2.13
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Assumed in business combination	48.40
Weighted Average Exercise Price, Forfeited	21.11	222.17
Weighted Average Exercise Price, Expired	473.92	269.87
Weighted Average Exercise Price, Outstanding Balance	7.99	$ 418.10	$ 411.60
Weighted Average Exercise Price, Vested and expected to vest	7.99
Weighted Average Exercise Price, Exercisable
Weighted-Average Remaining Contractual Life, Outstanding (in years)	9 years 4 months 24 days	8 years	7 years 7 months 6 days
Weighted-Average Remaining Contractual Life, Vested and expected to vest (in years)	9 years 4 months 24 days
Weighted-Average Remaining Contractual Life, Exercisable (in years)	0 years
Aggregate Intrinsic Value, Outstanding		$ 522
Aggregate Intrinsic Value, Outstanding			$ 522
Aggregate Intrinsic Value, Vested and expected to vest
Aggregate Intrinsic Value, Exercisable

Number of share option assumed in business combination.

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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 number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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 of the plan that expired.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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