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Capital structure (Tables)
12 Months Ended
Dec. 31, 2019
Stockholders' Equity Note [Abstract]  
Summary of the Company's outstanding warrants
The following is a summary of the Company’s outstanding warrants as of December 31, 2018:
 
 
Warrant shares
 
Exercise price
 
Expiration
Common stock
 
7,030

 
$
128

 
September 2019
Common stock
 
130

 
$
2,520

 
August 2019