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Stockholders' Equity (Details 1) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Stockholders' Equity [Abstract] |  |  |
Risk-free interest rate | 2.80% | 2.50% | 1.90%
Dividend yield | 0.00% | 0.00% | 0.00%
Expected volatility | 55.00% | 57.00% | 61.00%
Expected life | 6 years 6 months | 6 years 6 months | 6 years 6 months

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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + References No definition available. + Details
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- Definition Period the instrument, asset or liability is expected to be 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 Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References No definition available. + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References No definition available. + Details
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- References No definition available. + Details
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