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Stock-Based Compensation Plan (Details) - Employees and independent directors [Member] - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Number of Shares |  |  |
Outstanding, Beginning balance | 9,000 | 4,000 | 4,000
Exercisable, Beginning balance | 9,000 | 4,000 | 4,000
Granted |  | 5,000 |
Exercised |  |  |
Forfeited |  |  |
Outstanding, Ending balance | 9,000 | 9,000 | 4,000
Exercisable, Ending balance | 9,000 | 9,000 | 4,000
Average Exercise Price per Share |  |  |
Outstanding, Beginning balance | $ 5.4 | $ 10.2 | $ 10.2
Exercisable, Beginning balance | 5.4 | 10.2 | 10.2
Granted |  | 1.6 |
Exercised |  |  |
Forfeited |  |  |
Outstanding, Ending balance | 5.4 | 5.4 | 10.2
Exercisable, Ending balance | $ 5.4 | $ 5.4 | $ 10.2
Weighted Average Remaining Contractual Term in Years |  |  |
Outstanding, Beginning balance | 6 years 4 months 28 days | 3 years 9 months 7 days | 4 years 9 months 7 days
Exercisable, Beginning balance | 6 years 4 months 28 days | 3 years 9 months 7 days | 4 years 9 months 7 days
Granted | 0 years | 10 years | 0 years
Exercised | 0 years | 0 years | 0 years
Forfeited | 0 years | 0 years | 0 years
Outstanding, Ending balance | 5 years 10 months 28 days | 6 years 4 months 28 days | 3 years 9 months 7 days
Exercisable, Ending balance | 5 years 10 months 28 days | 6 years 4 months 28 days | 3 years 9 months 7 days

X
- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Share Based Compensation Arrangements By Share Based Payment Award Options Exercised Weighted Average Remaining Contractual Term2. + References No definition available. + Details
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- Definition Share based compensation arrangements by share based payment award options forfeited weighted average remaining contractual term2. + References No definition available. + Details
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- Definition 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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