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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015 and December 31, 2014:
 
 
 
 
 
Outstanding as of
 
Authorized
 
Issued
 
September 30,
2015
 
December 31, 2014
Common Stock, par $0.001
600,000,000

 
72,180,794

 
72,180,794

 
60,741,082

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

 
23

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, 2015 and December 31, 2014:
 
 
 
 
 
 
 
As of September 30, 2015
 
As of December 31, 2014
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

 
$
1,093,752

 
284,091

 
$
2,022,729

Warrants assumed in June 2009 Merger
 
$4.08-$5.08

 
April 28, 2016
 
296,813

 
—

 
727,969

 
—

Total
 
 
 
 
 
580,904

 
$
1,093,752

 
1,012,060

 
$
2,022,729