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Share-Based Compensation Plan (Tables) | 12 Months Ended
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Dec. 31, 2016
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 2016 and 2015 was $1.93 and $1.58, respectively, using the following weighted-average assumptions:
|  | Years Ended December 31,
|  | 2016 |  | 2015
Risk-free interest rate (%) |  |  | 1.75 | % |  |  | 2.10 | %
Dividend yield |  |  | — |  |  |  | — |
Volatility factor |  |  | 79.91 | % |  |  | 92.22 | %
Expected option life (years) |  |  | 5.6 |  |  |  | 4.8 |
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, 2016 and 2015:
|  | Years Ended December 31,
|  | 2016 |  | 2015
Total intrinsic value of stock options exercised |  | $ | 178,923 |  |  | $ | 60,056 |
Cash received from stock option exercises |  | $ | 178,512 |  |  | $ | 155,949 |
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, 2016 and 2015 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, 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 |  |  |  |  |  |  |  |  |
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 |  |  |  | 5.58 |  |  | $ | 3,401,944 |
Exercisable |  |  |  |  |  |  | 1,638,288 |  |  | $ | 2.23 |  |  |  | 4.58 |  |  |  | 2,651,676 |
Unvested |  |  |  |  |  |  | 522,797 |  |  | $ | 2.40 |  |  |  | 8.67 |  |  |  | 750,268 |
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, 2016:
|  |  |  |  | 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 |  |  |  | 369,444 |  |  |  | 6.58 |  |  | $ | 1.01 |  |  |  | 306,603 |  |  | $ | 1.02 |
| $1.20 - $1.25 |  |  |  | 56,000 |  |  |  | 6.50 |  |  | $ | 1.23 |  |  |  | 46,583 |  |  | $ | 1.22 |
| $1.50 - $1.82 |  |  |  | 167,767 |  |  |  | 5.33 |  |  | $ | 1.71 |  |  |  | 167,767 |  |  | $ | 1.71 |
| $1.89 - $2.27 |  |  |  | 477,090 |  |  |  | 6.50 |  |  | $ | 2.13 |  |  |  | 347,672 |  |  | $ | 2.08 |
| $2.36 - $2.92 |  |  |  | 525,638 |  |  |  | 5.58 |  |  | $ | 2.63 |  |  |  | 232,617 |  |  | $ | 2.54 |
| $3.04 - $3.54 |  |  |  | 528,446 |  |  |  | 3.67 |  |  | $ | 3.09 |  |  |  | 516,513 |  |  | $ | 3.08 |
| $3.70 - $3.84 |  |  |  | 35,000 |  |  |  | 9.42 |  |  | $ | 3.72 |  |  |  | 18,833 |  |  | $ | 3.71 |
| $6.90 |  |  |  | 900 |  |  |  | 1.58 |  |  | $ | 6.90 |  |  |  | 900 |  |  | $ | 6.90 |
| $10.00 |  |  |  | 800 |  |  |  | 0.17 |  |  | $ | 10.00 |  |  |  | 800 |  |  | $ | 10.00 |
| $0.95 - $10.00 |  |  |  | 2,161,085 |  |  |  | 5.58 |  |  | $ | 2.27 |  |  |  | 1,638,288 |  |  | $ | 2.23 |
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, 2016 and 2015, consisted of the following:
|  | Years Ended December 31,
Income Statement Classification |  | 2016 |  | 2015
Cost of revenues |  | $ | 40,929 |  |  | $ | 19,322 |
Research and development |  |  | 74,810 |  |  |  | 40,951 |
Sales and marketing |  |  | 87,158 |  |  |  | 62,898 |
General and administrative |  |  | 139,713 |  |  |  | 86,693 |
|  | $ | 342,610 |  |  | $ | 209,864 |

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