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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Shares of Common Stock Issuable on Conversion or Exercise of Rights Granted
As of December 31, 2015, 26 million shares of our common stock were issuable upon conversion, or exercise of rights granted (regardless of whether in or out-of-the-money), as summarized below:
Conversion of Series E Preferred Stock
40,000

2018 Convertible Notes
11,401,284

Exercise of issued employee stock options
13,836,851

Exercise of issued warrants
445,000

Management incentive plan restricted stock units
260,000

Total common shares
25,983,135

Summary of Warrant Activity
A summary of warrant activity is as follows:

Number of
Shares
 
Weighted
Average
Exercise Price
Outstanding — December 31, 2012
395,000

 
$
5.45

Granted
50,000

 
7.51

Outstanding — December 31, 2013
445,000

 
$
6.39

Granted

 

Outstanding — December 31, 2014
445,000

 
$
6.39

Granted

 

Outstanding — December 31, 2015
445,000

 
$
6.78

Exercisable — December 31, 2015
445,000

 
$
6.78