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Equity Financings and Warrants (Tables)
3 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Summary of Warrants by Year of Expiration

As of March 31, 2015, these warrants, by year of expiration, are summarized below:

 

Year of Expiration

 

Number

of Warrants

 

 

Weighted Average

Exercise Price

 

2016

 

 

579,712

 

 

$

9.74

 

2017

 

 

168,866

 

 

 

2.56

 

2018

 

 

6,742,068

 

 

 

1.68

 

2019

 

 

1,570,262

 

 

 

2.25

 

2020

 

 

310,094

 

 

 

2.28

 

 

 

 

9,371,002

 

 

$

2.31