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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

Number of Shares

June 30, 

December 31,

Weighted-Average

Description

2020

2019

Exercise Price

Expiration Date

Liability-classified Warrants

December 2019 Series B1 warrants (1)

2,368,400

2,368,400

$ 1.52

Dec 2026

2,368,400

2,368,400

Equity-classified Warrants

May 2013 warrants

 

1,949,754

1,949,754

$ 0.08

None

September 2013 warrants

 

514,756

514,756

$ 0.08

None

February 2014 warrants

 

266,006

266,006

$ 0.08

None

April 2020 warrants

3,039,514

$ 2.28

Apr 2023

5,770,030

2,730,516

Total outstanding

 

8,138,430

5,098,916

(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.