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Warrants (Tables)
12 Months Ended
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]  
Summary of Warrants
Stock purchase warrant activity is as follows:
 
Common Stock Warrants
 
Preferred Stock Warrants
 
Number
 
Weighted Average Exercise Price
 
Number
 
Weighted Average Exercise Price
Outstanding at December 31, 2016
7,031

 
$
0.57

 
25,779

 
$
6.21

Warrants acquired in Merger
13,534

 
$
80.70

 
—

 
$
—

Preferred stock warrants converted into Common Stock warrants
25,779

 
$
6.21

 
(25,779
)
 
$
6.21

Granted
24,097

 
$
7.15

 
—

 
$
—

Exercised
(21,092
)
 
$
3.04

 
—

 
$
—

Outstanding at December 31, 2017
49,349

 
$
27.65

 
—

 
$
—

Activity
—

 
$
—

 
—

 
$
—

Outstanding at December 31, 2018
49,349

 
$
27.65

 
—

 
$
—


A summary of outstanding Common Stock purchase warrants as of December 31, 2018 is as follows:
Number of Underlying Shares
 
Exercise Price
 
Expiration Date
13,534
 
$80.70
 
2019 & 2020
11,718
 
$8.53
 
2025
24,097
 
$7.15
 
2024
49,349