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Stock based compensation, options and warrants (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Recognized Stock-based Compensation | The Company recognized total stock-based compensation expense during the three and six months ended June 30, 2019 and 2018 granted under the Company’s 2017 equity incentive plan (the “Plan”), from the following categories:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Restricted stock awards under the Plan |  | $ | 115,026 |  |  | $ | 1,432,593 |  |  | $ | 291,570 |  |  | $ | 2,199,542 |
Stock option awards under the Plan |  |  | — |  |  |  | 175,493 |  |  |  | 58,498 |  |  |  | 292,487 |
Total stock-based compensation |  | $ | 115,026 |  |  | $ | 1,608,086 |  |  | $ | 350,068 |  |  | $ | 2,492,029
Summary of Restricted Plan Activity | A summary of the Company’s unvested restricted stock activity in the six months ended June 30, 2019 is presented here:
|  | Number of Shares |  | Weighted Average Grant-Date Fair Value
| Unvested at January 1, 2019 |  |  |  | 95,939 |  |  | $ | 12.49 |
| Vested |  |  |  | (37,459 | ) |  | $ | 8.01 |
| Granted |  |  |  | 24,500 |  |  | $ | 5.11 |
| Forfeited |  |  |  | (40,000 | ) |  | $ | 16.82 |
| Unvested at June 30, 2019 |  |  |  | 42,980 |  |  | $ | 7.43
Summary of Stock Incentive Plan Activity | A summary of activity under the Plan for the six months ended June 30, 2019 is presented below:
|  | Shares Underlying Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
| Outstanding at January 1, 2019 |  |  |  | 62,000 |  |  | $ | 15.71 |  |  |  | 9.2 |  |  | $ | — |
| Forfeited |  |  |  | (50,000 | ) |  | $ | 18.50 |  |  |  | — |  |  |  | — |
| Outstanding at June 30, 2019 |  |  |  | 12,000 |  |  | $ | 4.09 |  |  |  | 9.2 |  |  | $ | — |
| Exercisable at June 30, 2019 |  |  |  | 12,000 |  |  | $ | 4.09 |  |  |  | 9.2 |  |  | $ | —
Schedule of Changes in Outstanding Warrants | Following is a summary of outstanding warrants that were issued outside of the Plan for the six months ended June 30, 2019:
|  | Shares Underlying Options/Warrants |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
| Outstanding at January 1, 2019 |  |  |  | 1,671,113 |  |  | $ | 39.47 |  |  |  | 2.0 |  |  | $ | — |
| Granted |  |  |  | 1,908,144 |  |  | $ | 1.94 |  |  |  | 5.2 |  |  | $ | 2,537,832 |
| Forfeited |  |  |  | (5,000 | ) |  | $ | 7.90 |  |  |  | — |  |  | $ | — |
| Outstanding at June 30, 2019 |  |  |  | 3,574,257 |  |  | $ | 19.48 |  |  |  | 3.4 |  |  | $ | 2,289,773 |
| Exercisable at June 30, 2019 |  |  |  | 1,928,144 |  |  | $ | 19.48 |  |  |  | 0.7 |  |  | $ | —

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