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Common Stock, Preferred Stock and Warrants (Tables)
9 Months Ended
Sep. 30, 2021
Preferred Stock Common Stock And Warrants [Abstract]  
Summary of Common Stock Warrants Outstanding

During the nine months ended September 30, 2021, 946,150 of our common stock warrants were exercised. As of September 30, 2021, the following common stock warrants were outstanding:

 

Warrants Issuance Date

 

Shares Issuable
(in thousands)

 

 

Expiration Date

 

Exercise Price
per Share

 

 

Outstanding as of
September 30, 2021
(in thousands)

 

August 12, 2019

 

 

4,895

 

 

February 12, 2022

 

$

4.50

 

 

 

4,895