Stock Options (Tables)
|3 Months Ended|
Mar. 31, 2019
|Disclosure of Compensation Related Costs, Share-based Payments [Abstract]|
|Schedule of weighted-average assumptions using Black-Scholes option-pricing model||
Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef