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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Number of Options Outstanding |  |  |
Options outstanding | 100,279 | 41,581 |
Granted | 511,800 | 77,514 |
Cancelled/forfeited | (9,396) | (18,816) |
Options outstanding | 602,683 | 100,279 | 41,581
Unvested | 525,010 |  |
Vested and exercisable | 77,673 |  |
Weighted Average Exercise Price Per Share |  |  |
Options outstanding | $ 54.40 | $ 133.60 |
Granted | 4.17 | 14.20 |
Cancelled/forfeited (in dollars per share) | 101.05 | 64.60 |
Options outstanding | 11.01 | $ 54.40 | $ 133.60
Unvested | 4.64 |  |
Vested and exercisable | $ 54.05 |  |
Weighted Average Remaining Contractual Term (Years) |  |  |
Options outstanding | 9 years 4 months 21 days | 8 years 7 months 13 days | 8 years 1 month 17 days
Unvested | 9 years 9 months 18 days |  |
Vested and exercisable | 6 years 7 months 10 days |  |
Aggregate Intrinsic Value |  |  |
Options outstanding | $ 1,861 | $ 4 |
Unvested | 1,829 |  |
Vested and exercisable | $ 32 |  |

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- Definition 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. + References No definition available. + Details
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- Definition 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. + 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 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + 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 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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