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Capital Stock and Warrants (Tables)
12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Outstanding Warrants to Purchase Shares of Common Stock

At December 31, 2015, outstanding warrants to purchase shares of common stock are as follows:

 

Shares Underlying

Outstanding Warrants

 

 

Exercise Price

 

 

Expiration Date

 

2,046,139

 

 

$

2.75

 

 

January 2016

 

10,625,000

 

 

$

1.10

 

 

November 2016

 

28,097,400

 

 

$

0.65

 

 

June 2018

 

13,081,428

 

 

$

0.01

 

 

November 2019

 

22,011,265

 

 

$

0.75

 

 

November 2019

 

1,524,390

 

 

$

0.41

 

 

August 2020

 

77,385,622