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Equity (Tables)
 12 Months Ended
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     — %