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Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Reconciliation of Numerators and Denominators used in Computing Basic and Diluted Net Income Per Share | The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income per share:
|  | 12 Month Period Ended December 31, 2018 |  |  | 12 Month Period Ended December 31, 2017 |  |  | 12 Month Period Ended December 31, 2016 |
Net loss |  | $ | (5,172,436 | ) |  | $ | (7,759,472 | ) |  | $ | (6,316,021 | )
Cumulative dividends on Series G Preferred Stock |  |  | — |  |  |  | — |  |  |  | — |
Numerator, basic and diluted net loss available to stockholders |  | $ | (5,172,436 | ) |  | $ | (7,759,472 | ) |  | $ | (6,316,021 | )
|  | 12 Month Period Ended December 31, 2018 |  |  | 12 Month Period Ended December 31, 2017 |  |  | 12 Month Period Ended December 31, 2016 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Shares used in computation – basic: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 8,583,795 |  |  |  | 8,209,539 |  |  |  | 7,564,082 |
Shares used in computation – diluted: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 8,583,795 |  |  |  | 8,209,539 |  |  |  | 7,564,082 |
Net loss per share – basic and diluted |  | $ | (0.60 | ) |  | $ | (0.95 | ) |  | $ | (0.84 | )
Convertible Preferred Stock Excluded from EPS [Member] |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | Potential common shares from outstanding Convertible Preferred Stock calculated per the if-converted basis having an anti-dilutive effect on diluted earnings per share were excluded from potential common shares as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Excluded Convertible Preferred Stock |  |  | — |  |  |  | — |  |  |  | — |
In the Money Potential Common Shares [Member] |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The potential common shares, in the table following, represent potential common shares calculated using the treasury stock method from outstanding options and warrants that were excluded from the calculation of Diluted EPS:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Average market price during the period |  | $ | 6.81 |  |  | $ | 3.98 |  |  | $ | 3.46 |
In the money potential common shares from options excluded |  |  | 13,450 |  |  |  | 7,023 |  |  |  | 4,979 |
In the money potential common shares from warrants excluded |  |  | 50,640 |  |  |  | 13,869 |  |  |  | — |
Out of Money Potential Common Shares [Member] |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | Potential common shares from out-of-the-money options and warrants were also excluded from the computation of diluted earnings per share because calculation of the associated potential common shares has an anti-dilutive effect. The following table lists options and warrants that were excluded from diluted EPS.
Per share exercise price |  | 2018 |  |  | 2017 |  |  | 2016 |
Out of the money options excluded: |  |  |  |  |  |  |  |  |
$ 3.59 |  |  | — |  |  |  | — |  |  |  | 7,521 |
$12.48 |  |  | 136,833 |  |  |  | 137,666 |  |  |  | 137,666 |
$12.84 |  |  | 4,167 |  |  |  | 4,167 |  |  |  | 4,167 |
$26.40 |  |  | 75,158 |  |  |  | 75,158 |  |  |  | 75,158 |
$34.68 |  |  | — |  |  |  | — |  |  |  | 73,765 |
$39.00 |  |  | — |  |  |  | 8,333 |  |  |  | 8,333 |
$41.16 |  |  | — |  |  |  | — |  |  |  | 833 |
$42.00 |  |  | — |  |  |  | — |  |  |  | 8,333 |
$46.80 |  |  | — |  |  |  | — |  |  |  | 1,667 |
Out-of-the-money warrants excluded: |  |  |  |  |  |  |  |  |
$ 3.52 |  |  | — |  |  |  | — |  |  |  | 120,000 |
$ 7.16 |  |  | 700,000 |  |  |  | — |  |  |  | — |
$12.00 |  |  | 60,625 |  |  |  | — |  |  |  | — |
Total excluded |  |  | 981,783 |  |  |  | 225,324 |  |  |  | 437,443 |
Unvested Restricted Stock Awards Excluded from EPS [Member] |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The weighted average equivalent common shares relating to our unvested restricted stock awards that were excluded from potential common shares used in the earning per share calculation due to having an anti-dilutive effect are:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Excluded unvested restricted stock awards |  |  | 41,667 |  |  |  | 132,826 |  |  |  | 113,889 |

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