| Offering Date | | Outstanding Warrants | | Exercise Price | | Expiration Date | | Status | | ||||
| May 2009 | | | 711,539 | | $ | 8.58 | | | 5/29/2014 | | | Exercisable | |
| February 2010 | | | 420,000 | | $ | 27.50 | | | 2/1/2015 | | | Exercisable | |
| | | | 1,131,539 | | | | | | | | | | |