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Common Stock (Tables)
12 Months Ended
Dec. 31, 2019
Preferred Stock Common Stock And Warrants [Abstract]  
Summary of Common Stock Warrants Outstanding

As of December 31, 2019, 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, 2019

(in thousands)

 

August 12, 2019

 

 

5,841

 

 

February 12, 2022

 

$

4.50

 

 

 

5,841