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Warrants (Tables)
9 Months Ended
Sep. 30, 2019
Other Liabilities Disclosure [Abstract]  
Summary of Warrants
As of September 30, 2019, the Company had 46,522 Common Stock warrants outstanding at a weighted average exercise price of $17.93. A summary of outstanding Common Stock purchase warrants as of September 30, 2019 is as follows:
Number of Underlying Shares
 
Exercise Price
 
Expiration Date
10,707
 
$52.50
 
2020
11,718
 
$8.53
 
2025
24,097
 
$7.15
 
2024
46,522
 
 
 
 


Stock purchase warrant activity is as follows:
 
Common Stock Warrants
 
Number
 
Weighted Average Exercise Price
Outstanding at December 31, 2018
49,349

 
$
27.65

Expiries
(2,827
)
 
$
187.50

Outstanding at September 30, 2019
46,522

 
$
17.93