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Stock Options and Stock Grants (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of assumptions used to calculate black-scholes option pricing model for options granted | The following table illustrates the various assumptions used to calculate the Black-Scholes option pricing model for options granted for all years presented:
|  | Years Ended December 31,
|  | 2018 |  | 2017
Weighted-average risk-free interest rates: |  |  | 2.9 | % |  |  | 2.1 | %
Dividend yield: |  |  | 0.00 | % |  |  | 0.00 | %
Weighted-average expected life of the option: |  | 7 years |  | 7 years
Weighted-average expected stock price volatility: |  |  | 94 | % |  |  | 94 | %
Weighted-average fair value of the options granted: |  | $ | 0.64 |  |  | $ | 0.55 |
Schedule of option activity | The following table summarizes the option activity for our employees and directors during the year ended December 31, 2018:
|  |  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  | Weighted |  |  | Average |  |  |  |
|  |  |  |  | Average |  |  | Remaining |  |  |  |
|  |  |  |  | Exercise Price |  |  | Contractual |  |  | Aggregate |
|  | (rounded) |  |  | per |  |  | Term |  |  | Intrinsic |
Options |  | Shares |  |  | Share |  |  | (years) |  |  | Value (000s) |
Outstanding on January 1, 2018 |  |  | 3,141,000 |  |  | $ | 0.73 |  |  |  |  |  |  |  |  |
Granted |  |  | 571,000 |  |  | $ | 0.80 |  |  |  |  |  |  |  |  |
Exercised |  |  | (64,000 | ) |  | $ | 0.45 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (233,000 | ) |  | $ | 1.81 |  |  |  |  |  |  |  |  |
Outstanding on December 31, 2018 |  |  | 3,415,000 |  |  | $ | 0.67 |  |  |  | 5.8 |  |  | $ | 590 |
Exercisable on December 31, 2018 |  |  | 2,448,000 |  |  | $ | 0.65 |  |  |  | 4.7 |  |  | $ | 527 |
Shares available for grant |  |  | 664,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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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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- 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=109197908&loc=d3e5070-113901 + Details
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