| Exercise | Shares Issuable Upon Exercise of Warrants | |||||||||||||
| Series | Issuance Date | Expiration Date | Price | 2013 | 2012 | |||||||||
| Series A | December 1, 2010 | October 31, 2014 | $ | 4.00 | 1,700,000 | 1,700,000 | ||||||||
| Series B | December 1, 2010 | October 31, 2014 | $ | 1.20 | 340,000 | 340,000 | ||||||||
| Series B | December 1, 2010 | October 31, 2014 | $ | 4.00 | 170,000 | 170,000 | ||||||||
| Series B | December 1, 2010 | March 31, 2011(1) | $ | 0.10 | - | - | ||||||||
| Series C | February 28, 2011 | February 28, 2016 | $ | 2.00 | 1,500,000 | 1,500,000 | ||||||||
| Series D | February 28, 2011 | February 28, 2016 | $ | 1.20 | 150,000 | 150,000 | ||||||||
| Class A | December 2, 2011 | November 29, 2016 | $ | 1.50 | 4,800,000 | 4,800,000 | ||||||||
| Series E | June 29, 2012 | June 15, 2017 | $ | 1.55 | 296,300 | 296,300 | ||||||||
| Series E | July 6, 2012 | June 15, 2017 | $ | 1.55 | 72,500 | 72,500 | ||||||||
| Series E | July 31, 2012 | June 15, 2017 | $ | 1.55 | 57,160 | 57,160 | ||||||||
| Series E | September 5, 2012 | June 15, 2017 | $ | 1.55 | 111,400 | 111,400 | ||||||||