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Equity (Tables)
12 Months Ended
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