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Common Stock (Tables)
12 Months Ended
Dec. 31, 2021
Preferred Stock Common Stock And Warrants [Abstract]  
Summary of Common Stock Warrants Outstanding As of December 31, 2021, the following common stock warrants were outstanding:

 

Warrants Issuance Date

 

Shares Issuable
(in thousands)

 

 

Expiration Date

 

Exercise Price
per Share

 

 

Outstanding as of
December 31, 2021
(in thousands)

 

August 12, 2019

 

 

1,883

 

 

February 12, 2022

 

$

4.50

 

 

 

1,883