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Warrants (Tables)
 9 Months Ended
Sep. 30, 2019
Warrants and Rights Note Disclosure [Abstract]  
Summary of Change in Warrants
The following table summarizes the change in warrant shares for all outstanding warrants, including the Series B Warrants for the nine months ended September 30, 2019:
 
Number of
Warrant Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life (in years)
 
Weighted
Average
Fair Value
Outstanding at December 31, 2018
4,329,437

 
$1.03
 
3.7
 
$
0.26

Exercised
(200,000
)
 
1.00
 
8.2
 
—

Expired
—

 
—
 
—
 
—

Reserved for future issuance
1,336,326

 
0.67
 
2.6
 
0.20

Outstanding at September 30, 2019
5,465,763

 
$0.78
 
2.7
 
$
0.22