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Summary of Significant Accounting Policies (Net Loss Per Share Convertible Securities and Options Excluded) (Details) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Anti-dilutive shares | 7,768,000 | 7,192,000
Options and Warrants Exercisable |  |
Anti-dilutive shares | 6,619,000 | 7,007,000
Nonvested Restricted Stock Units |  |
Anti-dilutive shares | 1,490,000 | 185,000

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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://fasb.org/us-gaap/role/ref/legacyRef -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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