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Capital structure
12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Capital structure
Capital structure
Common stock
As of December 31, 2017, the Company’s number of authorized shares of common stock was 125,000,000.
Warrants
All of the Company’s outstanding warrants are classified as liabilities as of December 31, 2017 and 2016 because they contain non-standard antidilution provisions.
The following is a summary of the Company’s outstanding warrants as of December 31, 2017:
 
 
Warrant shares
 
Exercise price
 
Expiration
Common stock
 
7,030

 
$
128.00

 
2019
Common stock
 
130

 
$
2,520.00

 
2019
The following is a summary of the Company’s outstanding warrants as of December 31, 2016:
 
 
Warrant shares
 
Exercise price
 
Expiration
Common stock
 
6,250

 
$
128.00

 
2017
Common stock
 
7,030

 
$
128.00

 
2019
Common stock
 
130

 
$
2,520.00

 
2019