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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2013
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 June 30, 2013 and December 31, 2012:
 
 
 
 
 
Outstanding as of
 
Authorized
 
Issued
 
June 30,
2013
 
December 31,
2012
Common Stock, par $0.001
600,000,000

 
180,058,605

 
180,058,605

 
144,313,005

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 June 30, 2013 and December 31, 2012:
 
 
 
 
 
 
 
As of June 30, 2013
 
As of December 31, 2012
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
 
13,688,633

 
$
9,102,940

 
—

 
$
—

December 2011 financing
 
$
0.65

 
December 6, 2016
 
5,774,784

 
2,309,913

 
5,774,784

 
2,078,921

January 2011 financing
 
$
1.40

 
January 27, 2016
 
10,565,200

 
2,039,084

 
10,565,200

 
779,711

July 2009 financing
 
$
3.38

 
July 1, 2014
 
333,333

 
2,000

 
333,333

 
1,267

Warrants assumed in June 2009 Merger
 
$0.05-$1.28

 
September 27, 2013 - April 28, 2016
 
4,863,616

 
—

 
4,920,527

 
—

Total
 
 
 
 
 
35,225,566

 
$
13,453,937

 
21,593,844

 
$
2,859,899