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STOCK OPTIONS (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of stock options and stock awards | The status of our stock options and warrants are summarized as follows:
| Number of options and warrants |  | Weighted average exercise price
Outstanding at December 31, 2016 | 3,526,287 |  |  | $ | 3.17 |
Granted | 1,728,000 |  |  | 3.09 |
Exercised | (176,750 | ) |  | 2.41 |
Canceled and forfeited | (443,302 | ) |  | 3.95 |
Outstanding at December 31, 2017 | 4,634,235 |  |  | $ | 3.10 |
Granted | 225,000 |  |  | 2.40 |
Exercised | (1,378,615 | ) |  | 2.43 |
Canceled and forfeited | (225,841 | ) |  | 2.10 |
Outstanding at December 31, 2018 | 3,254,779 |  |  | $ | 3.18 |
Granted | 1,379,500 |  |  | 7.70 |
Exercised | (410,635 | ) |  | 2.99 |
Canceled and forfeited | (256,785 | ) |  | 4.76 |
Outstanding at December 31, 2019 | 3,966,858 |  |  | $ | 4.67 |
Number of weighted average grant-date fair values of options |
| Number of options |  | Weighted average grant date fair value
Non-vested at December 31, 2018 | 1,436,429 |  |  | $ | 1.68 |
Granted | 1,379,500 |  |  | 4.57 |
Vested | (1,119,000 | ) |  | 1.90 |
Forfeited | (212,000 | ) |  | 2.31 |
Non-vested at December 31, 2019 | 1,484,929 |  |  | $ | 4.11 |
Schedule of option fair value assumptions | Inputs used in the valuation models are as follows:
| 2019 Grants |  | 2018 Grants |  | 2017 Grants
Option value | $7.15 | - | $7.91 |  | $1.46 | - | $3.04 |  | $1.73 | - | $2.34
Risk-free rate | 1.7% | - | 2.6% |  | 1.9% | - | 2.5% |  | 1.5% | - | 1.9%
Expected dividend yield | —% |  | —% |  | —%
Expected volatility | 64.9% | - | 66.4% |  | 60.9% | - | 68.8% |  | 62.1% | - | 68.0%
Expected term (in years) | 4.5 | - | 6 |  | 6 |  | 6

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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 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. + 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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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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