v3.20.1

Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Share-based Compensation Arrangements | The following table summarizes stock-based compensation expense:
| Years Ended December 31, |  |
| 2019 |  | 2018
Stock options | $ | 1,542,644 |  |  | $ | 1,059,582 |
Restricted stock | 437,354 |  |  | — |
Total stock-based compensation expense | $ | 1,979,998 |  |  | $ | 1,059,582 |
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, 2017 |  | 3,851,371 |  |  | $ | 3.11 |  |  |  |  |  |
Granted |  | 340,000 |  |  | 1.18 |  |  | 0.54 |  |  |
Exercised |  | (52,500) |  |  | 1.24 |  |  |  |  |  |  |
Forfeited |  | — |  |  | — |  |  |  |  |
Expired |  | (271,250) |  |  | 3.22 |  |  |  |  |  |  |
Balance December 31, 2018 |  | 3,867,621 |  |  | 4.05 |  |  |  |  |  |
Granted |  | 2,450,000 |  |  | 0.96 |  |  | 0.51 |  |  |
Exercised |  | (736,552) |  |  | 0.72 |  |  |  |  |  |  |
Forfeited |  | (907,500) |  |  | 4.49 |  |  |  |  |
Expired |  | (948,569) |  |  | 5.01 |  |  |  |  |  |  |
Balance December 31, 2019 |  | 3,725,000 |  |  | $ | 2.32 |  |  |  |  |  |
Number of options exercisable at December 31, 2019 |  | 3,069,000 |  |  | $ | 2.35 |  |  |  |  | 5.4
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 |  |  | 2.57 |
Vested |  | (36,496) |  |  | 2.74 |
Forfeited |  | — |  |  | — |
Balance December 31, 2019 |  | 1,768,726 |  |  | $ | 2.57 |

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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