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Common Stock Warrants Outstanding
 3 Months Ended
Mar. 31, 2022
Other Liabilities Disclosure [Abstract]  
Common Stock Warrants Outstanding

8. Common Stock Warrants Outstanding

A summary of equity-classified common stock warrant activity for the three months ended March 31, 2022 is as follows:

 

 

 

 

 

 

 

 

 

 

 

Average

 

 

 

 

 

 

 

Weighted

 

 

Remaining

 

 

 

Number of

 

 

Average Exercise

 

 

Contractual

 

 

 

Shares

 

 

Price Per Share

 

 

Term in Years

 

Outstanding at December 31, 2021

 

 

857,261

 

 

$

31.73

 

 

 

2.2

 

Issued

 

 

—

 

 

$

—

 

 

 

—

 

Exercised

 

 

—

 

 

$

—

 

 

 

—

 

Expired

 

 

—

 

 

$

—

 

 

 

—

 

Outstanding at March 31, 2022

 

 

857,261

 

 

$

31.73

 

 

 

2.0

 

 

All warrants outstanding at December 31, 2021 and March 31, 2022 are exercisable.

Warrants issued in the February 2019 financing transaction have an expiration date of February 12, 2024, warrants issued in the March 2019 transaction have an expiration date of September 19, 2024, warrants issued in the May 2019 inducement offering have an expiration

date of December 2, 2024, warrants issued in December 2019 have an expiration date of December 11, 2024, and warrants issued in the January 2020 inducement offering have an expiration date of July 10, 2025.

The intrinsic value of equity-classified common stock warrants outstanding at December 31, 2021 and March 31, 2022 was $16,000 and $0, respectively.