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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2014
Stockholders' Equity Note [Abstract]  
Summary of preferred stock authorized, issued and outstanding
The following is a summary of the Company's authorized and issued common and preferred stock as of March 31, 2014 and December 31, 2013:
 
 
 
 
 
Outstanding as of
 
Authorized
 
Issued
 
March 31,
2014
 
December 31,
2013
Common Stock, par $0.001
600,000,000

 
240,146,343

 
240,146,343

 
210,304,821

Series A Preferred Stock, par $0.001
1,000

 
817

 
—

 
—

Series B Preferred Stock, par $0.001
1,000

 
750

 
—

 
—

Series C Preferred Stock, par $0.001
1,091

 
1,091

 
26

 
26

Series D Preferred Stock, par $0.001
1,966,292

 
1,966,292

 
—

 
—
Summary of warrants outstanding
The following table summarizes the warrants outstanding as of March 31, 2014 and December 31, 2013:
 
 
 
 
 
 
 
As of March 31, 2014
 
As of December 31, 2013
Issued in Connection With:
 
Exercise
Price
 
Expiration
Date
 
Number of
Warrants
 
Common Stock
Warrant Liability
 
Number of
Warrants
 
Common Stock
Warrant Liability
March 2013 financing
 
$
0.79

 
September 12, 2018
 
2,113,634

 
$
5,875,903

 
3,022,725

 
$
7,859,085

January 2011 financing
 
$
1.40

 
January 27, 2016
 
—

 
—

 
6,695,000

 
11,381,498

July 2009 financing
 
$
3.38

 
July 1, 2014
 
333,333

 
170,000

 
333,333

 
300,000

Warrants assumed in June 2009 Merger
 
$1.02-$1.28

 
August 1, 2015-
April 28, 2016
 
4,008,202

 
—

 
4,008,202

 
—

Total
 
 
 
 
 
6,455,169

 
$
6,045,903

 
14,059,260

 
$
19,540,583