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Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
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):
|  | 2017 |  |  | 2016 |
Risk-free interest rate |  |  | 2.2 | % |  |  | 1.5 | %
Expected term of options, in years |  |  | 6.6 |  |  |  | 6.5 |
Expected annual volatility |  |  | 83 | % |  |  | 80 | %
Expected dividend yield |  |  | — | % |  |  | — | %
Determined weighted average grant date fair value per option |  | $ | 0.18 |  |  | $ | 0.11 |
Summary of Stock Option Plans | A summary of the Company’s option plans as of December 31, 2017 and 2016, as well as changes during each of the years then ended, is presented below:
|  | 2017 |  |  | 2016 |
|  | Number of Options (in shares) |  |  | Weighted Average Exercise Price |  |  | Number of Options (in shares) |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 2,050,369 |  |  | $ | 3.62 |  |  |  | 2,364,918 |  |  | $ | 3.51 |
Granted at market price |  |  | 91,500 |  |  |  | 0.25 |  |  |  | 65,000 |  |  |  | 0.15 |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited or expired |  |  | (740,380 | ) |  |  | 3.54 |  |  |  | (379,549 | ) |  |  | 2.29 |
Outstanding at end of year |  |  | 1,401,489 |  |  |  | 3.45 |  |  |  | 2,050,369 |  |  |  | 3.62 |
Exercisable at end of year |  |  | 1,393,155 |  |  | $ | 3.47 |  |  |  | 2,004,534 |  |  | $ | 3.69 |
Summary of Information Regarding to Options Outstanding and Exercisable | Summary information regarding the options outstanding and exercisable at December 31, 2017 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 |  |  | 372,523 |  |  |  | 4.4 |  |  | $ | 0.50 |  |  |  | 364,189 |  |  | $ | 0.51 |
$0.97 – $2.49 |  |  | 422,785 |  |  |  | 3.6 |  |  | $ | 1.55 |  |  |  | 422,785 |  |  | $ | 1.55 |
$3.51 – $5.91 |  |  | 215,466 |  |  |  | 1.9 |  |  | $ | 4.66 |  |  |  | 215,466 |  |  | $ | 4.66 |
$6.31 – $7.57 |  |  | 227,356 |  |  |  | 1.9 |  |  | $ | 6.79 |  |  |  | 227,356 |  |  | $ | 6.79 |
$7.60 - $11.42 |  |  | 163,359 |  |  |  | 1.9 |  |  | $ | 8.82 |  |  |  | 163,359 |  |  | $ | 8.82 |
|  |  | 1,401,489 |  |  |  |  |  |  |  |  |  |  |  | 1,393,155 |  |  |  |  |
Summary of Warrant Activity | . A summary of warrant activity follows:
|  | 2017 |  |  | 2016 |
|  | 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 |  |  |  | 2,619,423 |  |  | $ | 1.48 |
Granted |  |  | — |  |  |  | — |  |  |  | 35,000 |  |  |  | 0.13 |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited or expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Outstanding and exercisable at end of year |  |  | 2,654,423 |  |  | $ | 1.46 |  |  |  | 2,654,423 |  |  | $ | 1.46 |
Warrants [Member] |
Schedule of Stock Options Fair Value Assumptions Estimated Using Black-Scholes Pricing Model | The fair value of the warrants granted in 2016 ($0.08 per warrant) was estimated on the grant dates using the Black-Scholes option-pricing model with the following weighted average assumptions:
Risk-free interest rate |  |  | 1.79 | %
Expected term of warrants |  |  | 7.0 years |
Expected annual volatility |  |  | 78 | %
Expected dividend yield |  |  | — | %

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&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://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=96867065&loc=d3e5070-113901 + Details
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