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Net Loss Per Share (Details Textual) - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock options [Member] |  |  |
Net Loss Per Share (Textual) |  |  |
Antidilutive securities excluded from computation of earnings per share | 0 | 4,000 | 7,000
Warrants [Member] |  |  |
Net Loss Per Share (Textual) |  |  |
Antidilutive securities excluded from computation of earnings per share | 4,100,000 | 5,100,000 | 13,000
Convertible preferred stock [Member] |  |  |
Net Loss Per Share (Textual) |  |  |
Antidilutive securities excluded from computation of earnings per share | 11,000 | 11,000 | 11,000

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- Definition Net loss per share. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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