FireEye, Inc. | 2013 | FY | 3

As of December 31, 2012, all of the convertible preferred stock warrants remained outstanding as follows (in thousands, except share and per share amounts):
 
Class of Shares 
 
Issuance Date(s) 
 
Expiration Date(s) 
 
No. of
Shares 
 
Exercise
Price per
Share 
 
As of December 31,
 
2012
Series A-2
 
2005 and 2006
 
2015 and 2016
 
245,899
 
$
0.61

 
$
1,632

Series B
 
2006 through 2008
 
2016 through 2018
 
118,942
 
$
1.32

 
925

Series D
 
June 2010
 
June 2020
 
100,000
 
$
0.39

 
634

Series E
 
August 2011
 
August 2021
 
60,661
 
$
1.36

 
338

Total
 
 
 
 
 
 
 
 
 
$
3,529

us-gaap:ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock