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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2020
Stockholders' Equity  
Schedule of warrants outstanding and exercisable for purchase of common stock

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Number of Shares

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June 30, 

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December 31,

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Weighted-Average

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Description

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2020

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2019

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Exercise Price

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Expiration Date

Liability-classified Warrants

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December 2019 Series B1 warrants (1)

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2,368,400

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2,368,400

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$ 1.52

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Dec 2026

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2,368,400

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2,368,400

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Equity-classified Warrants

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May 2013 warrants

 

1,949,754

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1,949,754

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$ 0.08

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None

September 2013 warrants

 

514,756

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514,756

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$ 0.08

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None

February 2014 warrants

 

266,006

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266,006

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$ 0.08

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None

April 2020 warrants

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3,039,514

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$ 2.28

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Apr 2023

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5,770,030

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2,730,516

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Total outstanding

 

8,138,430

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5,098,916

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(1)The Series B1 warrants are exercisable for either common stock (exercise price of $1.52) or Series B1 Convertible Preferred Stock (exercise price of $152) at the discretion of the warrant holder.