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Stock-Based Compensation (Schedule of Share Option Activity) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Options Outstanding
Options outstanding	831,611	535,617
Granted	1,550,270	306,304
Cancelled/forfeited	(376,319)	(10,310)
Options outstanding	2,005,562	831,611	535,617
Unvested	1,154,273
Vested and exercisable	851,289
Weighted Average Exercise Price Per Share
Options outstanding	$ 6.68	$ 11.10
Granted	0.71	1.51
Cancelled/forfeited (in dollars per share)	3.23	82.38
Options outstanding	2.72	$ 6.68	$ 11.10
Unvested	0.74
Vested and exercisable	$ 5.40
Weighted Average Remaining Contractual Term (Years)
Options outstanding		8 years 1 month 17 days	8 years 2 months 23 days
Unvested	9 years 22 days
Vested and exercisable	8 years 7 days
Aggregate Intrinsic Value
Vested and exercisable	$ 4

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

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross 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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. 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 exercisable options that may 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 exercisable or convertible options. 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 per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of non-vested options outstanding.

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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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