v3.19.1

Share-Based Compensation (Details) - $ / shares	12 Months Ended
Share-Based Compensation (Details) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date weighted average fair value	$ 5.38	$ 7.94
Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected life (in years)	6 years 25 days	7 years 3 months 18 days
Expected volatility	73.30%	76.40%
Risk-free interest rate	2.77%	1.87%

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Arcturus Therapeutics Ltd. 10-K