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Stock-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Stock-based compensation [Abstract] |
Schedule of Stock Option Plans | A summary of option transactions for all of the Company's stock options during the years ended December 31, 2016 and 2015 follows:
|  | Number of Stock Options |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2014 |  |  | 1,308,835 |  |  | $ | 2.76 |
Granted |  |  | 1,487,500 |  |  |  | 1.15 |
Exercised |  |  | - |  |  |  | - |
Expired/cancelled |  |  | (111,983 | ) |  |  | 10.70 |
Outstanding at December 31, 2015 |  |  | 2,684,352 |  |  |  | 1.54 |
Granted |  |  | 2,340,000 |  |  |  | 0.58 |
Exercised |  |  | - |  |  |  | - |
Expired/cancelled |  |  | (523,830 | ) |  |  | 2.07 |
Outstanding at December 31, 2016 |  |  | 4,500,522 |  |  | $ | 1.02 |
Exercisable at December 31, 2016 |  |  | 2,200,672 |  |  | $ | 1.48 |
Options expected to vest at December 31, 2016 |  |  | 2,049,850 |  |  | $ | 0.59 |
Schedule of Stock Options Outstanding | The outstanding and exercisable options at December 31, 2016, have a range of exercise prices and associated weighted remaining contractual life and weighted average exercise price, as follows:
Options Range of Exercise Prices |  |  | Outstanding Number of Shares |  |  | Weighted Average Remaining Contractual Life (years) |  |  | Weighted Average Exercise Price |  |  | Exercisable Number of Shares |  |  | Exercisable Weighted Avg. Exercise Price |
$ | 0 - $1.25 |  |  |  | 3,827,500 |  |  |  | 9.41 |  |  | $ | 0.80 |  |  |  | 1,530,000 |  |  | $ | 1.14 |
$ | 1.26 - $5.00 |  |  |  | 625,000 |  |  |  | 7.93 |  |  |  | 1.58 |  |  |  | 625,000 |  |  |  | 1.58 |
$ | 5.01 - $10.00 |  |  |  | 36,022 |  |  |  | 6.78 |  |  |  | 7.06 |  |  |  | 34,597 |  |  |  | 7.08 |
$ | 10.01 - $63.00 |  |  |  | 12,000 |  |  |  | 5.60 |  |  |  | 24.19 |  |  |  | 11,075 |  |  |  | 24.27 |
Total |  |  |  | 4,500,522 |  |  |  | 9.17 |  |  | $ | 1.02 |  |  |  | 2,200,672 |  |  | $ | 1.48 |
Schedule of Fair Value of Each Option Award Granted | The fair value of each option award granted during the period is estimated on the date of grant using the Black-Scholes option valuation model and assumptions as noted in the following table:
| Years Ended December 31,
| 2016 |  | 2015
Risk-free interest rate | 1.51 – 2.18% |  | 1.80 - 1.90%
Volatility | 50.00% |  | 50.00 - 85.68%
Expected dividend yield | 0% |  | 0%
Expected life | 6.5 years |  | 6.5 years
Estimated forfeiture rate | 0% |  | 0%

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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