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Equity Financings and Warrants (Tables)
9 Months Ended
Sep. 30, 2015
Equity [Abstract]  
Summary of Warrants by Year of Expiration

As of September 30, 2015, these warrants, by year of expiration, are summarized below:

 

Year of Expiration

 

Number

of Warrants

 

 

Weighted Average

Exercise Price

 

2016

 

 

82,816

 

 

$

68.19

 

2017

 

 

24,124

 

 

 

17.89

 

2018

 

 

963,153

 

 

 

11.77

 

2019

 

 

224,323

 

 

 

15.73

 

2020

 

 

44,299

 

 

 

15.96

 

2022

 

 

2,401,233

 

 

 

6.10

 

 

 

 

3,739,948

 

 

$

9.70