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Equity Financings and Warrants (Tables)
3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Summary of Warrants by Year of Expiration

As of March 31, 2018, these warrants, by year of expiration, are summarized below:

 

Year of Expiration

 

Number

of Warrants

 

 

Weighted Average

Exercise Price

 

2018

 

 

953,745

 

 

$

11.60

 

2019

 

 

224,323

 

 

 

15.73

 

2020

 

 

44,299

 

 

 

15.96

 

2022

 

 

2,401,233

 

 

 

6.10

 

 

 

 

3,623,600

 

 

$

8.26