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Warrants (Tables)
12 Months Ended
Dec. 31, 2021
Warrants  
Summary of warrants outstanding and exercisable

A summary of warrants outstanding and exercisable as of December 31, 2021 is as follows (in thousands, except as noted):

Warrants Outstanding

Warrants Exercisable

Weighted

Average

Weighted

Weighted

Remaining

Average

Average

Number

Contractual

Exercise

Number

Exercise

Year Issued

    

Outstanding

    

Life

    

Price

    

Exercisable

    

Price

 

(in years)

 

(per share)

 

(per share)

2016

 

6

 

$

466.26

 

6

$

466.26

2017

 

23

 

0.4

 

118.95

 

23

 

118.95

2018

 

120

 

2.2

 

19.20

 

120

 

19.20

2019

 

281

 

2.8

 

13.76

 

281

 

13.76

 

430

 

2.5

$

27.61

 

430

$

27.61