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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Minimum [Member] |  |
Stock-based compensation |  |
Vesting period | 3 years |
Maximum [Member] |  |
Stock-based compensation |  |
Vesting period | 4 years |
Board Director [Member] |  |
Stock-based compensation |  |
Vesting period | 1 year |
Stock Options [Member] |  |
Stock-based compensation |  |
Options granted (in shares) | 1,550,270 | 306,304
Percentage of vesting of awards | 25.00% | 25.00%
Resulting weighted average grant date fair value | $ 0.58 | $ 1.25
Remaining unrecognized compensation cost of non-vested stock options | $ 600 |
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost | 1 year 10 months 10 days |
Stock Options [Member] | Minimum [Member] |  |
Stock-based compensation |  |
Vesting period | 1 year |
Stock Options [Member] | Maximum [Member] |  |
Stock-based compensation |  |
Vesting period | 4 years |
Performance Share Options [Member] |  |
Stock-based compensation |  |
Options granted (in shares) |  | 174,272
Restricted Stock Units (RSUs) [Member] |  |
Stock-based compensation |  |
Compensation cost recognized | $ 0 |
Restricted Stock Units outstanding | 280,000 |
2018 Equity Incentive Plan (the "2018 Plan") |  |
Stock-based compensation |  |
Number of authorized shares | 1,500,000 |
Number of authorized additional shares to be issued | 709,889 |
Number of shares reserved for issuance | 208,789 |
2018 Equity Incentive Plan (the "2018 Plan") | Stock Options [Member] |  |
Stock-based compensation |  |
Life of stock option awards granted | 10 years |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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