| Summary of Exercisable Warrants Issued and Outstanding to Certain Employees and Director |
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Outstanding and exercisable at December 31, 2017 |
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— |
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— |
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— |
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535,446 |
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6.00 |
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2.00 |
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(321,268 |
) |
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6.00 |
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— |
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Outstanding and exercisable at December 31, 2018 |
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214,178 |
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6.00 |
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1.66 |
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— |
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— |
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— |
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(214,178 |
) |
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6.00 |
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— |
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Outstanding and exercisable at December 31, 2019 |
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— |
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— |
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— |
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— |
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— |
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— |
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— |
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— |
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— |
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Outstanding and exercisable at December 31, 2020 |
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— |
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— |
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— |
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