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Share-Based Compensation Plan (Tables) | 12 Months Ended
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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 |

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