| Summary of warrant activity |
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Warrants (1)
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Pre-Funded Warrants
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Weighted
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Weighted
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Average
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Average
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Exercise
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Exercise
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Activity
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Price
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Activity
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Price
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Outstanding at December 31, 2019
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1,659,763
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$
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10.68
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868,443
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$
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0.001
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Granted
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705,688
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$
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8.90
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—
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—
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Exercised
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(548,771)
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$
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2.35
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(300,350)
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$
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0.001
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Expired
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(625,642)
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$
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24.44
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—
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$
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—
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Outstanding at September 30, 2020
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1,191,038
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$
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6.24
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568,093
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$
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0.001
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(1)
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Excludes 803,300 Series A warrants that are held in abeyance. |
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