Stock Options - Schedule of Stock Option Fair Value Assumptions (Details) - $ / shares	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Expected life - years	3 years	3 years
Interest rate	1.93%
Volatility	43.89%
Weighted average fair value of options granted	$ 1.0959
Minimum [Member]
Interest rate		2.80%
Volatility		47.59%
Weighted average fair value of options granted		$ 0.4759
Maximum [Member]
Interest rate		2.96%
Volatility		51.85%
Weighted average fair value of options granted		$ 0.6313

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

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 award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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