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Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of information about stock options |
|  | Number of options |  |  | Weighted average exercise price |  |  | Weighted average contractual term (years) |  |  | Aggregate intrinsic value |
Outstanding at January 1, 2018 |  |  | 335,900 |  |  | $ | 5.61 |  |  |  |  |  |  |  |  |
Granted |  |  | 308,000 |  |  |  | 1.80 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (23,000 | ) |  |  | 4.99 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2018 |  |  | 620,900 |  |  | $ | 3.75 |  |  |  |  |  |  |  |  |
Granted |  |  | 1,694,851 |  |  |  | 1.00 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (203,766 | ) |  |  | 1.71 |  |  |  |  |  |  |  | 104,868 |
Expired |  |  | (25,000 | ) |  |  | 6.20 |  |  |  |  |  |  |  |  |
Exercised |  |  | (82,667 | ) |  |  | 0.84 |  |  |  |  |  |  |  | 67,911 |
Outstanding at December 31, 2019 |  |  | 2,004,318 |  |  | $ | 1.72 |  |  |  | 8.79 |  |  |  | 2,542,361 |
Vested and exercisable at December 31, 2019 |  |  | 804,651 |  |  | $ | 2.53 |  |  |  | 7.98 |  |  | $ | 873,997 |
Schedule of option input into a Black Scholes option pricing model |
|  | 2019 |  |  | 2018 |
Exercise price |  |  | $0.83 to $1.80 |  |  |  | $0.79 to $4.35 |
Expected life |  |  | 6.8 years |  |  |  | 6.0 years |
Expected volatility |  |  | 64 | % |  |  | 38 | %
Dividend yield |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 1.43% to 2.55 | % |  |  | 2.27% to 2.99 | %

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References 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 (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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