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Stockholders Equity (Tables)
6 Months Ended
Jun. 30, 2021
Stockholders Equity  
Summary of Warrant Information

At June 30, 2021, outstanding warrants to purchase shares of common stock are as follows:

Shares Underlying Outstanding Warrants

    

Exercise Price

    

Expiration Date

597,881

$

21.00

May 10, 2022

1,183,491

$

5.60

October 16, 2023

993,139

$

2.87

February 11, 2025

7,717,661

$

2.87

March 27, 2025

1,867,912

$

3.25

January 26, 2026

4,285,935

$

3.25

March 16, 2026

1,200

$

1,680.00

None

16,647,219