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Share-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Share-Based Compensation [Abstract] |
Summary of status of company's stock option plan | A summary of the activity for stock options issued under the Company's Plans for the indicated periods is presented below:
Stock Option Totals |  | Shares |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2016 |  |  | 3,214,398 |  |  | $ | 2.68 |
-Exercised |  |  | (1,545,161 | ) |  | $ | 2.27 |
-Granted |  |  | 1,400,203 |  |  | $ | 5.72 |
Outstanding at December 31, 2017 |  |  | 3,069,440 |  |  | $ | 4.28 |
-Exercised |  |  | (5,000 | ) |  | $ | 3.43 |
-Granted |  |  | 307,355 |  |  | $ | 2.37 |
-Cancelled |  |  | (2,519,243 | ) |  | $ | 4.93 |
Outstanding at September 30, 2018 |  |  | 852,552 |  |  | $ | 1.66 |
Weighted average contractual life and exercise price | The following is the weighted average contractual life in years and the weighted average exercise price at September 30, 2018 of:
|  |  |  |  | Weighted Average Remaining |  | Weighted Average |
|  | Number of Options |  |  | Contractual Life |  | Exercise Price |
Options outstanding and vested |  |  | 727,552 |  |  | 2.1 years |  | $ | 1.58 |

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- Definition Tabular disclosure for share-based compensation 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 (e) -URI http://asc.fasb.org/extlink&oid=109197908&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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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