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Subsequent Event (Tables)
 6 Months Ended
Jun. 30, 2015
Subsequent Event [Abstract]  
Common stock capital shares reserved for future issuance
The chart below summarizes shares of our common stock reserved for future issuance upon the exercise of warrants as of July 22, 2015:

(in thousands, except  price per share data) 
Shares
  
Exercise
Price
 
Expiration
Date
Investors – February 2011 financing
  
4,550
  
$
0.19
 
2/22/16
Investors – July 2015 financing (pre-funded) (1)
  
42,000
  
$
0.60
 
7/22/22
Investors – July 2015 financing
  
67,083
  
$
0.70
 
7/22/22
Deerfield – 2013 loan
  
7,000
  
$
2.81
 
2/13/19
Battelle – 2014 collaboration agreement
  
1,500
  
$
5.00
 
10/10/24
Former employee
  
30
  
$
3.20
 
3/18/16
PharmaBio – October 2010 financing
  
80
  
$
4.10
 
10/13/15
Kingsbridge – June 2010 CEFF
  
83
  
$
6.69
 
12/11/15
   
122,326
         

(1)
Investors in these warrants fully prepaid the $0.60 exercise price at the time of issuance.