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Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of Stock Options Fair Value Assumptions Estimated Using Black-Scholes Pricing Model | The Company utilized the Black-Scholes option-pricing model to estimate fair value, utilizing the following assumptions for the respective years (all in weighted averages):
|  | 2018 |  |  | 2017 |
Risk-free interest rate |  |  | 2.5 | % |  |  | 2.2 | %
Expected term of options, in years |  |  | 3.9 |  |  |  | 6.6 |
Expected annual volatility |  |  | 123.6 | % |  |  | 83 | %
Expected dividend yield |  |  | — | % |  |  | — | %
Determined weighted average grant date fair value per option |  | $ | 0.24 |  |  | $ | 0.18 |
Summary of Stock Option Activity | A summary of the Company’s option plans as of December 31, 2018 and 2017, as well as changes during each of the years then ended, is presented below:
|  | 2018 |  |  | 2017 |
|  | Number of Options (in shares) |  |  | Weighted Average Exercise Price |  |  | Number of Options (in shares) |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 1,401,489 |  |  | $ | 3.45 |  |  |  | 2,050,369 |  |  | $ | 3.62 |
Granted at market price |  |  | 175,000 |  |  |  | 0.32 |  |  |  | 91,500 |  |  |  | 0.25 |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (110,000 | ) |  |  | 4.32 |  |  |  | (740,380 | ) |  |  | 3.54 |
Outstanding at end of year |  |  | 1,466,489 |  |  |  | 3.01 |  |  |  | 1,401,489 |  |  |  | 3.45 |
Exercisable at end of year |  |  | 1,386,489 |  |  | $ | 3.16 |  |  |  | 1,393,155 |  |  | $ | 3.47 |
Summary of Information Regarding to Options Outstanding and Exercisable | Summary information regarding the options outstanding and exercisable at December 31, 2018 is as follows:
|  | Outstanding |  |  | Exercisable |
Range of Exercise Prices |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Life |  |  | Weighted Average Exercise Price |  |  | Number Exercisable |  |  | Weighted Average Exercise Price |
|  | (in shares) |  |  | (in years) |  |  |  |  |  | (in shares) |  |  |  |
$0.14 – $0.77 |  |  | 527,523 |  |  |  | 2.99 |  |  | $ | 0.45 |  |  |  | 447,523 |  |  | $ | 0.47 |
$0.97 – $2.49 |  |  | 422,785 |  |  |  | 1.53 |  |  | $ | 1.55 |  |  |  | 422,785 |  |  | $ | 1.55 |
$3.51 – $5.91 |  |  | 125,466 |  |  |  | 1.50 |  |  | $ | 4.24 |  |  |  | 125,466 |  |  | $ | 4.24 |
$6.31 – $7.57 |  |  | 227,356 |  |  |  | .83 |  |  | $ | 6.79 |  |  |  | 227,356 |  |  | $ | 6.79 |
$7.60 - $11.42 |  |  | 163,359 |  |  |  | .98 |  |  | $ | 8.82 |  |  |  | 163,359 |  |  | $ | 8.82 |
|  |  | 1,466,489 |  |  |  |  |  |  |  |  |  |  |  | 1,386,489 |  |  |  |  |
Summary of Warrant Activity | The Company has issued warrants at exercise prices equal to or greater than market value of the Company’s common stock at the date of issuance. A summary of warrant activity follows:
|  | 2018 |  |  | 2017 |
|  | Number of shares underlying warrants |  |  | Weighted Average Exercise Price |  |  | Number of shares underlying warrants |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 2,654,423 |  |  | $ | 1.46 |  |  |  | 2,654,423 |  |  | $ | 1.46 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited or expired |  |  | 262,281 |  |  |  | 3.14 |  |  |  | — |  |  |  | ― |
Outstanding and exercisable at end of year |  |  | 2,392,142 |  |  | $ | 1.28 |  |  |  | 2,654,423 |  |  | $ | 1.46 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -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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- 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=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 + Details
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