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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2014 and December 31, 2013:
 
 
 
 
 
Outstanding as of
 
Authorized
 
Issued
 
September 30,
2014
 
December 31, 2013
Common Stock, par $0.001
600,000,000

 
60,457,940

 
60,457,940

 
52,576,206

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

 
23

 
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 September 30, 2014 and December 31, 2013:
 
 
 
 
 
 
 
As of September 30, 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
 
$
3.17

 
September 12, 2018
 
284,091

 
$
2,207,388

 
755,681

 
$
7,859,085

January 2011 financing
 
$
5.60

 
January 27, 2016
 
—

 
—

 
1,673,750

 
11,381,498

July 2009 financing
 
$
13.50

 
July 1, 2014
 
—

 
—

 
83,334

 
300,000

Warrants assumed in June 2009 Merger
 
$4.08-$5.12

 
August 1, 2015- April 28, 2016
 
978,052

 
—

 
1,002,052

 
—

Total
 
 
 
 
 
1,262,143

 
$
2,207,388

 
3,514,817

 
$
19,540,583