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Share-Based Compensation Plan (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock options' weighted average assumptions

The Company calculates the value of each stock option grant, estimated on the date of grant, using binomial lattice option pricing model. The weighted-average estimated fair value of stock options granted during 2015 and 2014 was $1.58 and $0.96, respectively, using the following weighted-average assumptions:

 

   Years Ended December 31,
   2015  2014
Risk-free interest rate (%)    2.10%   2.56%
Dividend yield    —      —   
Volatility factor    92.22%   87.44%
Expected option life (years)    4.8    4.6 
Schedule of stock-based compensation, stock option, activity

The table below presents information related to socket option activity for the years ended December 31, 2015 and 2014:

   Years Ended December 31,
   2015  2014
Total intrinsic value of stock options exercised  $60,056   $20,684 
Cash received from stock option exercises   155,949    44,771 
Stock-based compensation arrangement by stock-based payment award, options, vested and unvested, outstanding and exercisable

Changes in stock options for the years ended December 31, 2015 and 2014 are as follows:

 

         Outstanding Options
    

 

Options

Available

For Grant

    

 

Number

of Shares

    

Weighted

Average

Price Per Share

    Remaining Contractual Term
(in years)		    

 

 

Intrinsic
Value

 
Balance at December 31, 2013    215,898    1,659,170   $2.47           
   Increase in shares authorized    191,843    —                  
   Granted    (382,000)   382,000   $1.41           
   Exercised    —      (31,475)  $1.50           
   Canceled    118,637    (118,637)  $2.65           
Balance at December 31, 2014    144,378    1,891,058   $2.09           
   Increase in shares authorized    200,000    —                  
   Granted    (316,600)   316,600   $2.25           
   Exercised    —      (91,333)  $1.71           
   Canceled    93,972    (93,972)  $2.01           
Balance at December 31, 2015    121,750    2,022,353   $2.15    5.83   $879,566 
Exercisable         1,547,485   $2.32    5.00    627,777 
Unvested         474,868   $1.42    8.67    251,789 
Schedule of stock-based compensation, shares authorized under stock option plans, by exercise price range

The following table summarizes information about stock options outstanding and exercisable at December 31, 2015:

 

      Options Outstanding     Options Exercisable
 

 

Range of

Exercise

Prices

    

 

Number of

Options Outstanding

    Weighted Average Remaining Life (Years)    

 

Weighted

Average Exercise Price

    

 

Number of Options Exercisable

    

 

Weighted Average Exercise Price

 
 $0.95 - $1.10    414,303    7.58   $1.01    270,686   $1.03 
 $1.20 - $1.25    58,000    7.50   $1.22    41,583   $1.21 
 $1.50 - $1.82    186,857    6.33   $1.70    184,532   $1.70 
 $1.89 - $2.27    539,695    7.25   $2.11    314,964   $2.04 
 $2.36 - $2.74    260,379    2.42   $2.48    172,601   $2.51 
 $3.04 - $3.45    560,819    4.50   $3.08    560,819   $3.08 
$6.90    900    2.58   $6.90    900   $6.90 
 $10.00 - $11.70    1,400    0.75   $10.73    1,400   $10.73 
 $0.95 - $11.70    2,022,353    5.83   $2.15    1,547,485   $2.24 
Schedule of employee service stock-based compensation, allocation of recognized period costs

The stock-based compensation expense included in the Company’s statements of income for the years ended December 31, 2015 and 2014, consisted of the following:

 

   Years Ended December 31,
Income Statement Classification  2015  2014
  Cost of revenues   $19,322   $21,597 
  Research and development    40,951    54,679 
  Sales and marketing    62,898    33,030 
  General and administrative    86,693    95,372 
   $209,864  $204,678