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Warrants
 9 Months Ended
Sep. 30, 2019
Warrants and Rights Note Disclosure [Abstract]  
Warrants Warrants

The Series B warrants contain provisions, often referred to as “down-round protection,” that leads to adjustment of the exercise price and number of underlying warrant shares if the Company issues securities, including its common stock or convertible securities or debt securities, in the future at sale prices below the then-current exercise price. This adjustment feature of the Series B Warrants was triggered during the three months ended September 30, 2019 with the issuance of common stock in the 2019 ATM Offering and Firm Commitment Offering at prices below the then applicable exercise price of the outstanding Series B Warrants (Note 15). As such, the exercise price of the Series B Warrants was adjusted from $1.00 per share to $0.67 per share and the number of shares of
common stock reserved for and issuable upon the exercise of outstanding Series B Warrants is increased by 1,336,326 underlying warrant shares, from 2,729,085 underlying warrant shares at June 30, 2019 to 4,065,411 underlying warrant shares at September 30, 2019.
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