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Share-Based Compensation Plan (Tables)
 12 Months Ended
Dec. 31, 2017
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 2017 and 2016 was $2.60 and $1.93, respectively, using the following weighted-average assumptions:

 

   Years Ended December 31,
   2017  2016
Risk-free interest rate (%)    2.34%   1.75%
Dividend yield    —      —   
Volatility factor    69.62%   79.91%
Expected option life (years)    5.9    5.6 

 
Schedule of stock-based compensation, stock option, activity

The table below presents the information related to stock option activity for the years ended December 31, 2017 and 2016:

   Years Ended December 31,
   2017  2016
Total intrinsic value of stock options exercised  $333,849   $178,923 
Cash received from stock option exercises  $331,719   $178,512 

 
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, 2017 and 2016 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, 2015   121,750    2,022,353   $2.15           
   Increase in shares authorized   224,818    —                  
   Granted   (344,450)   344,450   $2.89           
   Exercised   —      (111,855)  $1.60           
   Canceled   93,863    (93,863)  $2.73           
Balance at December 31, 2016   95,981    2,161,085   $2.27           
   Increase in shares authorized   235,136    —                  
   Granted   (275,300)   275,300   $4.13           
   Exercised   —      (159,839)  $2.08           
   Canceled   29,520    (29,520)  $2.98           
Balance at December 31, 2017   

85,337

    2,247,026   $2.50    5.08   $2,579,046 
Exercisable        1,746,173   $2.28    4.08    2,301,010 
Unvested        500,853   $3.28    8.58    278,036 

  
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, 2017:

 

      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 - $1.25    385,323    5.58   $1.04    373,337   $1.04 
 $1.50 - $1.82    150,255    4.17   $1.72    150,255   $1.72 
 $1.89 - $2.27    429,362    5.58   $2.13    357,912   $2.11 
 $2.36 - $2.92    485,823    4.42   $2.64    309,530   $2.59 
 $3.04 - $3.54    503,063    2.83   $3.10    482,605   $3.08 
 $3.70 - $4.49    292,300    9.33   $4.11    71,634   $3.94 
 $6.90    900    0.58   $6.90    900   $6.90 
 $0.95 - $6.90    2,247,026    5.08   $2.50    1,746,173   $2.28 

  
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, 2017 and 2016, consisted of the following:

 

   Years Ended December 31,
Income Statement Classification  2017  2016
  Cost of revenues   $64,834   $40,929 
  Research and development    104,205    74,810 
  Sales and marketing    111,087    87,158 
  General and administrative    146,824    139,713 
   $426,950  $342,610