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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2016
Equity [Abstract]  
Outstanding Warrants to Purchase Shares of Common Stock

At March 31, 2016, outstanding warrants to purchase shares of common stock are as follows:

 

Shares Underlying

Outstanding Warrants

 

 

Exercise Price

 

 

Expiration Date

 

10,625,000

 

 

$

1.100

 

 

November 2016

 

28,097,400

 

 

$

0.650

 

 

June 2018

 

13,081,428

 

 

$

0.010

 

 

November 2019

 

22,011,265

 

 

$

0.750

 

 

November 2019

 

2,272,727

 

 

$

0.275

 

 

August 2020

 

29,090,910

 

 

$

0.420

 

 

February 2021

 

105,178,730