v3.20.4

Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Share-based Compensation Arrangements | The following table summarizes stock-based compensation expense:
| Years Ended December 31,
| 2020 |  | 2019
Stock options | $ | 792,055 |  |  | $ | 1,542,644 |
Restricted stock | 3,228,750 |  |  | 437,354 |
Total stock-based compensation expense | $ | 4,020,805 |  |  | $ | 1,979,998 |
The following table summarizes stock option activity:
|  | Number of Options |  | Weighted Average Exercise Price per Option |  | Weighted Average Grant Date Fair Value per Option |  | Weighted Average Remaining Contractual Life (Years)
Balance, December 31, 2018 |  | 3,867,621 |  |  | $ | 4.1 |  |  |  |  |
Granted |  | 2,450,000 |  |  | 1.0 |  |  | 0.5 |  |  |
Exercised |  | (736,552) |  |  | 0.7 |  |  |  |  |
Forfeited |  | (907,500) |  |  | 4.5 |  |  |  |  |
Expired |  | (948,569) |  |  | 5.0 |  |  |  |  |
Balance, December 31, 2019 |  | 3,725,000 |  |  | 2.3 |  |  |  |  |
Granted |  | 877,575 |  |  | 1.9 |  |  | 0.6 |  |  |
Exercised |  | (2,112,392) |  |  | 2.4 |  |  |  |  |
Forfeited |  | (118,943) |  |  | 5.8 |  |  |  |  |
Expired |  | (20,000) |  |  | 2.4 |  |  |  |  |
Balance, December 31, 2020 |  | 2,351,240 |  |  | $ | 2.0 |  |  |  |  | 5.5
Number of options exercisable at December 31, 2020 |  | 1,972,740 |  |  | $ | 2.1 |  |  |  |  | 5.8
The following table summarizes restricted stock activity:
|  | Number of Unvested Shares |  | Weighted Average Grant Date Fair Value per Share
Balance, December 31, 2018 |  | — |  |  | $ | — |
Granted |  | 1,805,222 |  |  | 2.6 |
Vested |  | (36,496) |  |  | 2.7 |
Forfeited |  | — |  |  | — |
Balance, December 31, 2019 |  | 1,768,726 |  |  | 2.6 |
Granted |  | 657,135 |  |  | 2.9 |
Vested |  | (1,047,972) |  |  | 2.6 |
Forfeited |  | — |  |  | — |
Balance, December 31, 2020 |  | 1,377,889 |  |  | $ | 2.7 |

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