Significant Accounting Policies (Details 6)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Data Related to Options to Purchase the Company Shares [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Forfeiture rate	0.00%	0.00%	2.00%
Maximum [Member]
Data Related to Options to Purchase the Company Shares [Line Items]
Risk free interest rate	2.906%	1.39%	1.00%
Expected volatility	51.76%	57.73%	60.84%
Expected term (in years)	5 years 6 months	5 years 6 months	5 years 6 months
Minimum [Member]
Data Related to Options to Purchase the Company Shares [Line Items]
Risk free interest rate	0.78%	0.86%	0.80%
Expected volatility	40.16%	52.25%	55.81%
Expected term (in years)	4 years	4 years	4 years

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- Definition

Expected forfeiture rate.

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No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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

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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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 (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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