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Capital Stock and Warrants (Tables)
12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Outstanding Warrants to Purchase Shares of Common Stock

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

 

Shares Underlying

Outstanding Warrants

 

 

Exercise Price

 

 

Expiration Date

 

28,097,400

 

 

$

0.650

 

 

June 2018

 

22,011,265

 

 

$

0.750

 

 

November 2019

 

2,272,727

 

 

$

0.275

 

 

August 2020

 

28,274,910

 

 

$

0.420

 

 

February 2021

 

80,656,302